Bubbles!!!
Amelie had the wonderfull idea of building toys that could spread bubbles around the place and i've been trying to think up some ways of doing this.
The simplest solution is to say, make a stick with a hoop on each end and then dip it. If you got the speed right you should get some bubble action going on. This is a bit clunky and stoppy starty though.
Am wondering though if it would be possible to make a toy that could hold the liquid and make some use of the centrifugal force during spinning to push the bubbles out. I cant think of any way to do this yet though as the bubbles also need air being pushed out.
