This is a simple mixin to build sprites and yours css classes.
Sass
and Compass
// Import
@import mixin-sprite-retina
// Some Icons
$some-map: sprite-map('sprites/some/*.png')
$some-map-retina: sprite-map('sprites/some2x/*.png')
+generate-sprites('some', $some-map, $some-map-retina)
Your HTML:
<i class="some-stuff"></i>
๐ป