I like to keep certain greeting cards aswell, especially ones from my family overseas. Just can't bear to part with the pretty ones.
I collect postcards. Whenever my husband and I travel we've always bought postcards. And if friends or family travel, I always get them to mail me a postcard of their destination. Sometimes the postcard photographs capture more than we can with our own camera.
I use to have a large collection of rabbits, stuffed toy ones, ceramic ones, pictures etc, but I parted with alot them.
I have alot of books, don't know if that counts as a collection!
Your friend in Christ