$x: pop;
$y: 123;



div {
  foo: url(bloo/blah.css);
  bar: url(http://foo/bar/hux.css);
  foo: url(fudge#{$x}.css);
  bar: url("http://fudge#{$x}/styles.css");
  hux: url(http://box_#{$y}////fudge#{$x}.css);
  @each $i in (1 2 3 4 5) {
    hux: url(http://box_#{$y}////fudge#{$x}.css);
    foo: url(http://blah.com/bar-#{$i}.css);
  }
  gloo: url("hey#{1+2}.css");
  floo: url(hadoop-#{$y+321}.css);
  flum: image-url("fudge.png", hux);
  /*****/
  $bg: "image.png";
  background: url("#{$bg}");
  //gudge: url(type-of(hello) + length(a b c));
  mudge: url(data:image/png;base64,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);
  nudge: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAAAAAA6mKC9AAAAGElEQVQYV2N4DwX/oYBhgARgDJjEAAkAAEC99wFuu0VFAAAAAElFTkSuQmCC);
  pudge: url(http://wiki.jbussdieker.name/skins/common/images/Checker-16x16.png?2012-05-02T13:40:00Z);
}

p:after {
  content:url(data:image/png;base64,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 );
}