I spotted that John Ashton over at Heresy and Heroes had posted up about his "6 Paints" challenge, where he'd select six random paints and a random miniature to paint up over a two week period. There was something really appealing about this because it's not only a bit different, but also a good way to push yourself as a painter. To help things along, I've quickly put together this web app to help you select six different Citadel Colour paints.
You can select what colours you've not got from the range, and can limit the ones chosen based on paint type. Metallics and Shades you can determine a specific number to pick from too - so you'll know that you're going to have a metallic/shade available (if you wish!). I've included Abaddon Black and White Scar as the additional black & white options based on the rules in John's article - have fun!