Colored glass would be cool, but I'd personally love to have glowing colored blocks. Combine sand, glowdust, and dye, toss it in the furnace, and ta-da. Colored mood lighting, giant neon billboards, you name it.
TheGodBen wrote:

There's a new poisonous blue spider that spawns in the new dungeons. Well, I'm never going underground again. 
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Sweet! And webs finally appear as well.
Also, my mod pick of the week, is Fossils.
http://www.youtube.com/watch?v=t01sP...&feature=feedu
I swear, as soon as the finished game is released, I'm gonna fill my worlds with bunnies and dinosaurs.