Spriting technique for compass and auto width/height setup.

_sprites.sass

$parts: sprite-map("sprites/*.png", $layout: smart)
$parts_names: sprite_names($parts)

.sprite
  +inline-block
  background: $parts
  background-repeat: no-repeat

@each $sprite in $parts_names
  .sprite_#{$sprite}
    background-position: sprite-position($parts, $sprite)
    width: image-width("sprites/#{$sprite}.png")
    height: image-height("sprites/#{$sprite}.png")