So I attempted this nail polish effect called double fading, where you pull the colour into the one below it to create a gradient. I really don't like how this turned out, but I'll post it anyway.
I don't mind the way the green mixed into the yellow, but the blue remained too opaque on its own. Except on my pinky nail... it looks awesome on that one.
I used Sally Hansen Xtreme Wear in Mellow Yellow, Green with Envy and Blue Me Away.