Anything you draw with WigglyPaint is completely yours and free to use however you wish. If you make a big project using WigglyPaint to create the graphics, I'd love to hear about it!
Decker- the tool WigglyPaint is built on- is free and open-source, under the MIT license. If you want to use the "wiggler" contraption in your own decks, you may do so with no strings attached.