I shot these per the setup in David Boehm's Pop Photo article of April 2007. The technique works great and is simple to pull off. These were shot in my garage (see my setup shot) today. The blue ones are naturally colored, but using a white balance of "fluorescent" to bring it out more. The red and multi-colored ones were originally blue, but I re-colored them in Photoshop. The red one was done via a Hue/Saturation adjustment layer and the multicolored one was done with a Hue transfer mode on a new layer.
Strobist: ISO 100, ƒ/11, 1/200s, flashes left and right at 1/2 power, triggered with Gadget Infinity eBay trigger.