We have a blue piano.
Although this project wasn't necessarily hard, it was time consuming. Mostly because for the first time in my life I actually followed the rules and sanded down the surfaces between every single coat (and there were several) To help keep the dust out of the piano, I used a wet sandpaper with a fine grit (220).
Color, nice and bright and fun. But help me out here - should I leave the bench black or paint it blue to match (it was too stained with something red to refinish the wood)? I can't decide.