There are several creative forces out there, including several of Volkswagen's Fun Theory projects, encouraging people to do something good for the environment (and themselves) by making it fun. Here are some outstanding examples.
Scratch Mat - Makes wiping your feet a lot of fun!
Garbage Bin - Encourages people to pick up and toss in litter
Bottle Bank Arcade - Collects bottles for recycling
Wall O' Shirts - Kids will want to clean their rooms!
Musical Staircase - You've already seen this one, but it's also part of this project, and so much fun to watch, we didn't think you'd mind seeing it again.