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HTML 

              
                .picker
  %h1 Loading Animation Mixins
  .select-wrapper
    %select.selector
      %option{:value=>""}Select
      %option{:value=>"spinner"}Spinner
      %option{:value=>"propeller"}Propeller
      %option{:value=>"line"}Line
      %option{:value=>"wheel"}Wheel
      %option{:value=>"bounce"}Bounce
      %option{:value=>"text"}Text
      %option{:value=>"hourglass"}Hourglass
      %option{:value=>"pinwheel"}Pinwheel
      %option{:value=>"beer"}Beer
      %option{:value=>"clock"}Clock
.container
  #stage
!

CSS 

              
                @import "compass/css3";

$bkg: #ff704d;
@import url(https://fonts.googleapis.com/css?family=Cinzel|Julius+Sans+One);

html,body{
  margin: 0;
  padding: 0;
  background: $bkg;
  font-family: "Julius Sans One", sans-serif;
}

//SPINNER
@mixin spinner($color,$dur,$width,$height:$width){
 width: $width;
  height: $height;
  border-radius: 50%;
  box-shadow:0px 0px 0px 1px rgba(0,0,0,0.1), 2px 1px 0px $color;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: ($height/2)*-1;
  margin-left: ($width/2)*-1;
  @include animation(spin $dur linear infinite);
  @include keyframes(spin){
  100%{
    @include transform(rotate(360deg));
  }
  };
}

//PROPELLER
@mixin propeller($size,$dur, $center-color,$wing-color:$center-color){
  width: $size;
  height: $size;
  border-radius: 50%;
  background: $center-color;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: ($size/2)*-1;
  margin-left: ($size/2)*-1;
  @include animation(rotate $dur linear infinite);
  &:before, &:after{
    width: $size+10;
    height: 2px;
    background: $wing-color;
    position: absolute;
    content:'';
    margin-top: $size/2;
  }
  &:before{
    margin-left: ($size+20)*-1;
  }
  &:after{
    margin-left: $size+10;
  }
@include keyframes(rotate){
  100%{
    @include transform(rotate(360deg));
  }
};
}

//LINE
@mixin line($final-width,$color, $dur){
  position: absolute;
  width: 0px;
  height: 1px;
  top: 50%;
  left: 50%;
  margin-left: ($final-width/2)*-1;
  border-right: 5px solid white;
  background-color: $color;
  box-shadow: 0 0 10px $color;
  @include animation(line $dur ease-out infinite);
  @include keyframes(line){
    0%{
      width: 0;
    }
    100%{
      width: $final-width;
      opacity: 0;
    }
  }
}

//WHEEL
@mixin wheel ($size, $color-a, $color-b, $dur){
  width: $size;
  height: $size;
  border-radius: 50%;
  background: $color-a;
  overflow: hidden;
  position: relative;
  top: 50%;
  left: 50%;
  margin-top: ($size/2)*-1;
  margin-left: ($size/2)*-1;
  &:before,&:after{
    content:'';
    position: absolute;
    border-left: ($size/2) solid transparent;
    border-right: ($size/2) solid transparent;
  }
  &:before{
    border-top: ($size/2) solid $color-b;
  }
  &:after{
    border-bottom: ($size/2) solid $color-b;
    margin-top: ($size/2);
  }
  @include animation(wheel $dur linear infinite);
  @include keyframes(wheel){
    100%{
      @include transform(rotate(360deg));
    }
  }
}

//BOUNCE
@mixin bounce($size, $color, $dur){
  width: 5px;
  height: $size*4;
  border-bottom: 1px solid rgba(0,0,0,0.1);
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -2px;
  margin-top: ($size*2)*-1;
  @include animation(shadow $dur ease-in-out infinite);
  @include keyframes(shadow){
    50%{
      width: $size;
      border-bottom: 2px solid rgba(0,0,0,0.1);
      @include translateX(($size/2)*-1);
    }
  }
  &:before{
  content:'';
  width: $size;
  height: $size;
  background: $color;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: ($size*2)*-1;
  margin-left: ($size/2)*-1;
  @include animation(bounce $dur ease-in-out infinite);
  @include keyframes(bounce){
    25%{
      height: $size;
      border-radius: 0px;
    }
    50%{
      @include transform(rotate(180deg));
      margin-top: $size - 2;
      border-radius: 50%;
    }
    100%{
      @include transform(rotate(540deg));
    }
  }
  }
}

//TEXT
@mixin text($text,$color,$font-size,$dur){
  height:60px;
  width: 100%;
  top: 50%;
  margin-top: -30px;
  text-align: center;
  position: absolute;
  &:before{
    content:$text;
    font-family: "Julius Sans One",sans-serif;
    color: transparent;
    vertical-align: -50%;
    font-size: $font-size;
    letter-spacing: -6px;
    @include animation(fade $dur ease-in-out infinite);
    @include keyframes(fade){
      0%,100%{
        text-shadow: 0px 0px $font-size;
      }
      25%, 75%{
        color: transparent;
      }
      50%{
        text-shadow: 0px 0px 0px $color;
        letter-spacing: 4px;
        color:$color;
      }
    }
  }
}

//HOURGLASS
@mixin hourglass($width,$height,$glass,$sand,$dur){	
	position: absolute;
	border-radius: 50%;
	overflow: hidden;
	width: $width;
	height: $height;
	top: 50%;
	background: $glass;
	left: 50%;
	margin-left: ($width/2)*-1;
	margin-top: ($height/2)*-1;
	@include animation(turn $dur ease-in-out infinite);
		@include keyframes(turn){
			60%{
				@include transform(rotate(0deg));
			}
			100%{
				@include transform(rotate(180deg));
			}
		}
	&:before,&:after{
		border-left: ($width/2) solid transparent;
		border-right: ($width/2) solid transparent;
		content:'';
		position: absolute;
	}
	&:before{
		border-top: ($height/2) solid $sand;
		@include animation(drain $dur ease-in-out infinite);
	}
	&:after{
		border-bottom: 0px solid $sand;
		margin-top: ($height/2);
		@include animation(fill $dur ease-in-out infinite);
		@include transform(rotateY(90deg));
	}
	@include keyframes(drain){
		60%,100%{
			border-top:0px solid $sand;
			@include transform(rotateY(90deg) translateY(($height/2)));
		}
	}
	@include keyframes(fill){
    0%, 5%{
      border-bottom: 0px solid $sand;
    }
		70%,100%{
			border-bottom: ($height/2) solid $sand;
			@include transform(rotateY(0deg));
		}
	}
}

//PINWHEEL
@mixin pinwheel($width, $height, $pin-size, $speed){
  width: $width;
  height: $height;
  left: 50%;
  top: 50%;
  margin-left: ($width/2)*-1;
  position: absolute;
  margin-top: (($height/2)*-1)+$pin-size;
  background: #ddd;
  &:before{
  content:'';
    position: absolute;
    width: $pin-size;
    height: $pin-size;
    margin-top: $pin-size*-1;
    margin-left: (($pin-size/2)-$width)*-1;
    background: #ddd;
    border-radius: 50%;
    box-shadow: 0px 0px 5px 2px #666,
      0px ($pin-size+5) 0px 7px rgba(#D11919,0.5),
      -3px ($pin-size+3) 0px 7px mix(black,rgba(#D11919,0.4),20),
      ($pin-size+5) 0px 0px 7px rgba(#339966,0.5),
      ($pin-size+3) -3px 0px 7px mix(white,rgba(#339966,0.4),40),
      (($pin-size+5)*-1) 0px 0px 7px rgba(#FFDA45,0.5),
      (($pin-size+5)*-1) -3px 0px 7px mix(black,rgba(#FFDA45,0.4),30),
      0px (($pin-size+5)*-1) 0px  7px rgba(#993399,0.5),
      3px (($pin-size+5)*-1) 0px 7px mix(white,rgba(#993399,0.4),30);
    @include animation(wind $speed linear infinite);
    @include keyframes(wind){
      100%{
        @include transform(rotate(360deg));
      }
    }
      
  }
}

//BEER
@mixin beer($width, $height, $color,$dur){
	width:$width;
	height: $height;
	border-left: 3px solid #ddd;
	border-right: 3px solid #ddd;
	border-bottom: 2px solid #ddd;
	position: absolute;
	top: 50%;
	left: 50%;
  border-radius: 0 0 10% 10%;
	margin-top: ($height/2)*-1;
	margin-left: ($width/2)*-1;
	background: rgba(255,255,255,0.5);
	@include animation(tilt $dur linear infinite);
	@include keyframes(tilt){
		0%,60%{
			@include transform(rotate(0deg));
		}
		70%,90%{
			@include transform(rotate(90deg));
		}
	}
	&:before{
	  width: 3px;
		height: 0px;
		background: $color;
		content:'';
		position: absolute;
		margin-left: 23px;
    margin-top: -60px;
		@include animation(pour $dur linear infinite);
		@include keyframes(pour){
			30%{
				opacity: 0.7;
				height: $height - 10;
        margin-top: 10px;
			}
			50%,100%{
        margin-top:10px;
        opacity: 0;
			}
		}		
	}
	&:after{
		width: $width;
		height: 0px;
		bottom: 0;
		background: $color;
		content:'';
    border-radius: 0 0 10% 10%;
		position: absolute;
    @include animation(height $dur linear infinite);
    @include keyframes(height){
      0%,30%{
        height:0px;
        box-shadow: 0px -3px 0px #eee;
      }
      50%,70%{
        height: $height - 30;
        right: 0;
        width: $width;
        box-shadow: 0px -20px 0px #eee;
      }
      72%{
        box-shadow: 0px 0px 0px #eee;
      }
      75%,100%{
        right:0;
        width: 0px;
        height: $height+30
      }
    }
	}
}


//CLOCK
@mixin clock($size, $dur){
	border: 2px solid #222;
	box-shadow: 3px 3px 0px rgba(0,0,0,0.1), inset 0px 0px ($size/20) black,inset
		-5px -7px 0px 0px rgba(255,255,255,0.6);
	width: $size;
	height: $size;
	left: 50%;
	top: 50%;
	margin-left: ($size/2)*-1;
	margin-top: ($size/2)*-1;
	border-radius: 50%;
	background:#CCEAEA;
	position: absolute;
	&:before,&:after{
		position: absolute;
		content:'';
		top: 50%;
		width: $size/25;
		background: black;
		border-radius: 0 0 100% 100%;
		transform-origin: top;
		margin-left: ($size/2);
		@include keyframes(tick){
			100%{
				@include transform(rotate(360deg));
			}
		}
	}
	&:before{
		height: 35%;
		background: black;
		@include animation(tick $dur*2.5 linear infinite);
	}
	&:after{
		height: 40%;
		@include animation(tick $dur linear infinite);
	}
}

.spinner{
  @include spinner(white,0.7s,50px);
}
.propeller{
  @include propeller(20px,350ms, #009999, white);
}

.line{
  @include line(200px, #D14719, 2s);
}

.wheel{
  @include wheel(50px,#ddd,#990000,0.75s);
}

.bounce{
  @include bounce(25px, white, 2s);
}

.text{
  @include text("loading",white,15px,5s);
}

.hourglass{
  @include hourglass(50px,100px,transparent,#eee,3.5s);
}

.pinwheel{
  @include pinwheel(3px,75px,10px,0.3s);
}

.beer{
	@include beer(50px,90px,#E8BF19,6s);
}

.clock{
	@include clock(50px, 3s);
}


//OTHER STYLES
.container{
  width: 300px;
  height: 300px;
  border: 1px solid rgba(255,255,255,0.2);
  position: absolute;
  border-radius: 10px;
  top: 50%;
  left: 50%;
  margin-top: -150px;
  margin-left: -150px;
  box-shadow: -7px 7px 0px mix(black,$bkg,2);
}
.picker{
  position: absolute;
  z-index:11;
  width: 100%;
  margin: 0;
  padding: 15px 0;
  background: #222;
  text-align: center;
  border-bottom: 5px solid mix(black,$bkg,10);
}
.select-wrapper{
  width: 200px;
  height: 30px;
  background: black;
  border-bottom: 1px solid #bbb;
  margin: 0 auto;
  overflow: hidden;
}
.selector{
  background: transparent;
  border-radius: 0;
  border: 0;
  font-size: 20px;
  text-transform: uppercase;
  font-family: "Julius Sans One",sans-serif;
  letter-spacing: 4px;
  width: 200px;
  height: 30px;
  color: #bbb;
  cursor: pointer;
  outline: none;
}
h1{
  color: #eee;
  letter-spacing: 3px;
  font-size: 25px;
  margin: 0 0 10px 0;
}
!

JS 

              
                $(document).ready(function(){
  $(".selector").on("change",function(){
    var loader=$(".selector").val();
    $("#stage").removeClass();
    $("#stage").addClass(loader);
  });
})
!
999px

Console