It's called a "Nobbly Bobbly" and I saw them today in the supermarket - It takes me back to being a kid and I had to buy them along with a packet of "Fabs." :-)
Strobist info - This could be the start of a new thing - Speed-strobism! Trying to adjust 2 lights and a reflector before the damn thing melted away.
Canon 430EZ to camera rear with a blue gel and a 1ND filter on it to enhance blue further firing into a translucent screen,
Canon 430EZ (Yes I have 2 matching flashes now - woooohooh!) to camera rightinto a small home made softbox on 1/4 power. Reflector to lolly left to provide fill.