Welcome! If you want to look at some of the really fun and crazy stuff people have done, check out the āimpress your friendsā project reports list in the community ā created wiki. Some of these are very practical, some are just for fun.
Kids tend to particularly like the āmood cubeā where you put a multi sensor, which has an accelerometer, inside a cube and then you can make turning to each side of the cube control something different. Many people use this to change colors on a Hue bulb.