Here's a snapshot of a program I'm working on called "Zen Playground". It will let you interact with things in a virtual world, such as musical instruments, a fishtank, a zen rock garden, a painting canvas, bonsai trees, etc.. You'll be able to feed the fish, clip bonsai trees, move flickering candles around, paint, etc. It will be 'alive', so trees and fish will grow for example.
It's very crude at present since it's in the early stages, any suggestions are welcome.