I just realized you made this poll. I want to collect something, I just don't know what. I did used to collect each state's 25 cent coin, since the back of each state's 25 cent coin is different. I lost the book before being able to finish the collection, but inevitably that had to end anyway, I don't know where my book went. I'd imagine if anyone took it or found it that they at least got a few dollars from it. It was a special unique book. Specifically made for 25 cent coin collecting. It'll have a place for you to place the coin in and it'll say the state's name either under or on top. I really liked it. I think collecting money from each place I visit in the future would be cool.