Here's my first piece. It was clear before I first toked, but then it turned these beautiful opalescent colors. http://i43.tinypic.com/2qv8f3b.jpg Damn, I need to dust that counter, haha.
it's called color changing glass. how many bowls did you smoke? if you just got it today then it changed color pretty quickly. i'm sure it'll continue to change though
I've only smoked once out if it so far (I'm trying to stay clean so I can give blood), but that was a couple weeks ago.
BtownBlazer, your sig picture is beautiful! I didn't realize it was color changing when I bought it. It was just a beautiful clearish, opalescent. It was just one of the cheapest pieces in the shop, haha.