Make Your Own Lava Lamp

If you're a going to attempt to make your own lamp, we have all the formulas here. First I should say that the experience can be fun but it is not neccessarily cheap. As a matter of fact, just buying a new lamp is probably cheaper. On the other hand, the obsessively inquisitive won't sleep until they crack the code!
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thanks to boingboing

Not only do they have recipes for a variety of goos but you can order real lava lamps.