-(1..8).each do |i|
  %div.texture

html { background: silver; }
.texture {
  display: inline-block;
  width: 16em; height: 9em;
  background:
    linear-gradient(45deg, 
      transparent 2px, dimgrey 2px, dimgrey 3px, transparent 3px), 
    linear-gradient(-45deg, 
      transparent 2px, dimgrey 2px, dimgrey 3px, transparent 3px)
    darkgrey;
  @for $i from 1 through 8 {
    &:nth-child(#{$i}) { background-size: #{3 + $i}px #{3 + $i}px; }
  }
}