Hearts-on-a-string...Super quick, super easy, and a great use of scrap paper. AND! This stands out as the kinda project you can do while in a meeting or class, and make it look like you're totally paying attention!
"Cut colored paper into 3/4" strips. Fold them in half, or if you want some hearts that are twice as big, splice two strips of paper together at the bottom of each heart with double stick tape. Curl the loose ends around a chopstick or pen."