Mixin to generate random color in LESS

randomColor.less

.randomColor(){
  @randomColor: `Math.floor(Math.random()*16777215).toString(16)`;
  @colorHex: e(@randomColor);
  @color: ~"#@{colorHex}";
}

// USE

body {
  .randomColor();
  background-color: @color;
}

Sometimes the code snippet generates an invalid hex code (with 5 number/letters) Use this instead to fix the issue:

.randomColor() {
  @randomColor: `(Math.random()*0xFFFFFF<<0).toString(16)`;
  @colorHex: e(@randomColor);
  @color: ~"#@{colorHex}";
}

I found the answer in the comment section of this post:
https://css-tricks.com/snippets/javascript/random-hex-color/

This always gives a color:
spin(#F0F, @i*@colorsneeded)

example https://codepen.io/anon/pen/BZzPvL