Demonstrates a list and random() to show a randomly generated background image. Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0)
// Compass (v1.0.0.alpha.18)
// ----

$imgKey: random(5);

$list: apple, banana, cherry, durian, eggplant;
$nth: nth($list, $imgKey);

body {
  background-image: "/images/#{$nth}.jpg";
}

SassMeister-output.css

body {
  background-image: "/images/eggplant.jpg";
}