This will sound ridiculous, but on "Webkinz" (if you're a parent you know that this is a website designed for kids with games and activities), they have this game called Color Storm. Little colored drops fall down and you have to line it up with the matching colors. It's a very simple game.
I've tried doing searches on both the market and Google and can't find anything similar for Android. It looks like there's an iOS game called Color Storm but the video of it is something entirely different from this.
This is what I'm looking for... any ideas? I've searched various words like color, clouds, droplets, storm, raindrops, etc... but nothing.