How wonderful that I found this thread!
I'm rather new at the "serious" collecting game, but I did collect TMNT figures like you wouldn't believe when I was younger (Still have them in my old toy box), but I never put them on display or anything. I was also a big Troll collector. Not sure I kept all of those though.
Nowadays, I'm really into bobbleheads. The bulk of my (small) collection in made up of superheroes, but I also have Ezio Auditore and Sonic the Hedgehog on the shelf as well plus a long wish list of other bobbleheads.
I'll have to look for some of my stuff and take some pics, there's some pretty cool figures in my vast collection.