I know Bill has an extensive collection, and I'm guessing some other folks on this board do too.
Some of my favorites are:
Chinese Alligator postage stamps
Antique silver spoons
My personalized truck license plate "G8R"
A chainsaw carved cypress log alligator
But I think the coolest are two of my pinball machines, "Gator" and "Nip-It". If you ever watched "Happy Days" there was a "Nip-It" in the malt shop on the series--an interesting anachronism, since the show was set in the 1950s and the machine was built in 1973.
There was an early video game/pinball combo called "Granny and the Gators", but it isn't much fun to play, so I've never bought one.
One other pinball on my want list is called "Surf 'n Safari" and has a cartoon gator on a water slide on the backglass and a toy gator on the playfield.
There are some pictures of them at the link below. Be sure to scroll down to see them.
So what are your favorite collectibles?
Alligators on Pinballs

