If you have this game and want to make some creatures that you may be able to turn into monsters in Monster Mash, feel free to post here or PM me. I'd love to get some new monster models to play with.
The cool thing about Spore is it's very, very simple to create creatures in it. A friend of mine owns the game, and I actually made a respectable Mutalisk (the flying dragon/worms from Starcraft) in about 20 minutes of playing around when I was at his place.
The big problem with the game - I don't want to buy games that are going to install rootkits on my machine, so I kind of refuse to get it on principle.