Books, both current and antique (hundreds, on bookcases and just all throughout the house)
The letter “N”, for my last name (everything from art prints to ‘sign style’ “N“s, to printer’s blocks and baby blocks, to a light switch cover)
Silver and tin baby cups (12 or so, all on one display shelf)
Chairs (full size and miniature, I have no idea how many)
Birds (fewer than 10 small metal or ceramic birds, pretty much all in one place)
Of those, the only ones that have any bulk to them are the books and the chairs. I had to stop collecting full size chairs, there is just no room for more in this house. I have a terrible time getting rid of books. I need more bookcases, damn it.
Obviously, I’m a collector by nature, but I generally keep the collections confined and out of the way. I do have a lot of clutter in my house, but not from my collections (unless you count art/craft supplies… which I guess you could). It’s just a very small house with no storage. :(