Ticket stubs from all sporting events and concerts. Frame them in 8x10 with a picture from the event. For special games I'll professionally frame the program/ticket stub/pic and I now collect posters from every concert/festival I attend that sells them. Have 300+ 8x10's in my apt, 16 professional sports frames and 21 concert posters. Still have a couple hundred ticket stubs and 14 concert/festival posters to frame ups uncle works for 3M and hooks me with the double sided hanging strips which cuts down on a fairly costly aspect of the process. Even with that, it's become an expensive hobby.