I have always been more on the sentimental side and have a hard time throwing things away that have some kind of warm memory attached to them.
Throughout our home there is quite a variety of keepsakes. From the tiny little footprints of our newborns to the little ceramic shoes my mother always gives to each of her grandchildren on their first Christmas. I had been looking forward to having four little shoes in a row in my china cupboard, but when Buddy's shoe arrived with his name on the opposite side of the shoe, my OCD tendencies kicked in and it now has claim to its own shelf.
I have key-chains, dishes, lamps, clothes, books, toys, and more which have all passed the stage of being useful, but still have a special place in our home, simply because they qualify as keepsakes.