When I was younger, I would take empty glass bottles, fill them with water, and then take the insides out of highlighters.  If you squeeze the liquid out of the foam insert of the highlighter into the water, it will turn the water whatever color you squeezed out.  Better yet, throw a blacklight at it and you have an instant glowing glass object.  I loved it.  Fast forward to my old age of 37, and here is an updated version of that.  I could see myself trying to turn all sorts of stuff into lamps, because, I do love lamp.

Check out the design of this thing over at Taxi.