I spent part of my weekend playing with the spore creature creator. It's pretty cool. You can do about a million thing with it, though i don't like how you can only make symmetrical creatures. I could have also used fur.
It's like playing with Meta balls from old software packages. You pretty much HAVE to make mouths and eyes on them too, and i like little slits or small mouths instead of the gummy lippy jaw heavy choices you have in the creator program. It's a good way to exercise creativity though.
There's a feature to make avatars animations in it, so i did these ones: