Lighten/Darken
The CSS preprocessors Sass and LESS can take any color and darken() or lighten() it by a specific value. But no such ability is built into JavaScript. This function takes colors in hex format (i.e. #F06D06, with or without hash) and lightens or darkens them with a value.
From http://css-tricks.com/snippets/javascript/lighten-darken-color/