Like raeanna, stones are it for me. (sorry about your collection, rae)
I like natural or man-made polished stones, but if a stone has an interesting shape, or hew, I'll add it to my collection.
I regularly have 3-4 in my pocket.
I don't really collect books, just seem to have a rather large collection of paperbacks, and some hardbacks.
Also, WK's cool-factor went up another 20% in my eyes.
I like a good yo-yo, too. Just don't have a collection.
I had a Yomega stolen from me at school back in the early 90's. Saddened me.