I voted packrat but I'm not nearly as bad as my neighbor (who keeps EVERYTHING, including old magazines/catalogs). We do have a lot of stuff, but most of it is useful stuff - really! Our tool collection would probably put Sears to shame but we have a lot of projects, from building a garden shed to putting in a decorative concrete walkway around the house, to stone steps going up to the gardens, to finishing the basement...
I'm a book collector, too... at last count I had over 300 horse books and I'm rapidly catching up with dog books. That doesn't include the numerous reference books, favorite series, favorite authors and random novels, history books (Sis has always been an avid student of the Civil War), biographies, autobiographies, etc. that are all over the house.
I collect dog figurines (anything except resin or plastic) - I started with a china collie my great grandmother gave me over 40 years ago and the curio cabinet is getting pretty darned full. Also have cast iron dogs around the house and an almost life-size chalk spaniel sitting beside my chair.
Lastly, I've been collecting Vaseline glass (it has uranium in it and glows in sunlight or black light) but that's hard to find, so I don't have many pieces.