My group of buddies has:

Aqualung- My personal piece, a single blown blue bubbler with a really big pack
Leonidas- A yellow bowl that has lived through multiple drops.
Red Dragon- A 1 1/2 foot red ceramic bong with red and white swirls
Green Dragon- A 3 foot bong with extra thick walls and glow in the dark paint.
Pudding Bowl- a Bowl that looks like it's made of pudding

and I think thats it.