The most recent version of Sass (v3.3.0) adds a new random
function. If you mix that with a list of images (and a wee bit of variable interpolation), you will have CSS with a randomly selected background image every time Sass is compiled. Example:
$imgKey: random(5);
$list: apple, banana, cherry, durian, eggplant;
$nth: nth($list, $imgKey);
body {
background-image: "/images/#{$nth}.jpg";
}
Live example: http://sassmeister.com/gist/8966210
As above, the random value will only change when the Sass is compiled, which won't necessarily be every time your page is visited.
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