I thought these might be fun things to do with all this extra paper I have laying around.
Origami (I'm sure this has been mentioned before)
Paper airplanes - Could be like cubimals and measure how long they fly or how many loops they can do
Confetti to throw
Pirate hats
Combine several pieces together and make an address book to save all your friends' street locations for easy visiting
Might have a few more in my head, but just thought I'd toss these up.