A little while ago I did a tutorial for colour block tips which you can see here. I liked them so much I've done them in another colour with the colour blocks overlapping the other way. Which admittedly I didn't notice until just now!
My base colour is Sally Hansen Ion, the yellow is Barry M Lemon Ice Cream and silver is China Glaze Icicle.
A few people have showed me their different colour combinations and I love them all!