I've been using [0] and the Material Design color guidelines [1] lately, they're great!
[0]http://colours.neilorangepeel.com/ [1]http://www.google.com/design/spec/style/color.html#color-ui-...
[0]http://colours.neilorangepeel.com/ [1]http://www.google.com/design/spec/style/color.html#color-ui-...