I believe that this is the same stuff I was asking about a few days ago. Look at the thread titled Gel Cylinders. This is usually used by Disney in the DP party centerpieces. It is really inexpensive and looks cool.
My DH just bought a 1lb bag of it on ebay with shipping for $12. We got clear crystals - since all you have to do is tint water with food coloring and mix it together. Four teaspoons of the stuff, once water was added, filled up a giant mixing bowl. Enough for a dozen centerpieces.
Here are some pics of Courtney and Eric's DP - I hope they don't mind that I snagged them. These have the light up cubes in them, and this is what I want for our at home reception. But you can do all kinds of stuff with it.