I also have an extremely modest collection of autographed baseballs - signed by Hall of Famers. It has been collected primarily in person at the Cooperstown Induction weekends over the past several years. The rest would be from auctions won, or purchases on the MLB.com website shop.
I hope to show a display of the balls here sometime, but I am bumping up against bandwidth limits for this website service, and I have not yet figured out a nice way to take photos of the balls that will display them nicely. Check back again later for images!