We work currently in an interactive arts project called HAWilux in our university. Using Processing, Arduino, vvvv, OpenNI as software together with projectors, kinects, we create visual effects you can play with. Actually it is really hard because you need creativity to let the visuals make an interesting appearance. We have already made a few different installations, along with videos and pictures.
We also enjoyed playing around with ProcessingJS animations, to spice up our newly launched blog 
Interactive light installation using LEDs controlled by an Arduino device