I purchased some shirts, hats, a flag, going to definitely end up getting one of the really nice plaques, thinking about the one they have at the NBA store that has a picture in the middle from the championship game and then photos of players around it. They don't have the pictures up yet for it, but you can preorder it now to have it shipped when it comes out in July.
I also just preordered the Celtics Championship DVD, and the newspapers from the championship game.
I can also report that my credit card has definitely taken a little hit, and the more I see the bigger of a hit due to the Celtics winning the championship and me wanting to buy everything. I'm not complaining though.
That framed ticket idea is awesome! I went to the games in the finals, tickets aren't in the best shape, but maybe I will do something with those
~J