I collect a few things myself, I always get happy when I get new items.
Here's just a small sample of my collection, there's too much too show.
One of my most favorite things to collect are stuffed animals, or as they are called plushies, not all of them are Pokemon, I tend collect them based on my favorite animals.
(http://i1092.photobucket.com/albums/i420/DennyPacificNW/Nonsense%20Photos/20160209_031433_zpsidhgpbh8.jpg)
The ones in my photo:
Top row: Otter plush I bought at Woodland Park Zoo, Espurr holdig a Pokepuff, Sylveon, and Kyubey
lower: lion plush, RJ from the movie 'Over the Hedge', custom made Pyroar (female) plush, Mienfoo, Ninetales, laying down Lucario, Flareon, Cheetah, right above it is my sleeping closed eyes plush
On the very far right Delphox and Braixen are visible - right below them you can probably make out the two Meowstic ears (I got both male and female), and another Espurr
for the Pokemon cards, I have thousands.
The other 3 are sort of 'country' related items I really like collecting too
One of my favorite things to collect are flags both current and historical
Can't show all of them way too many - my most expensive have been three historical
(East Germany $125, Romania Communist flag $130, Zaire $110)
(http://i1092.photobucket.com/albums/i420/DennyPacificNW/Nonsense%20Photos/20160209_031941_zpsqrimvzyf.jpg)
I also love collecting currency - some have been left as tips in my mom's hotel job, others my grandma pased down to me as she got them from friends, others have sent them to me, a few friends have sent to me
Coins
(just realized I accidently dropped one of my US quarters in there, doesn't need to be there)
(http://i1092.photobucket.com/albums/i420/DennyPacificNW/Nonsense%20Photos/20160209_032222_zpsv8zcznvy.jpg)
and paper money
(http://i1092.photobucket.com/albums/i420/DennyPacificNW/Nonsense%20Photos/20160209_032805_zpshn3w4a9e.jpg)