I like Jelly Fish.
Mostly since watching the movie Seven Pounds featuring Will Smith.
ThinkGeek has this cool mood lamp with swimming jellys.
I am mostly infatuated with anything colorful, and lighted, and weird shaped, or irregular; at the moment. and water/tank objects. Basically stuff that you can stare at for a long and it never gets boring.
Lamps and lights of all sorts are very exciting, and I would be happy with one of everything.