A fun cake filled with a colorful sweet surprise that tumbles out when you cut into it, revealing to your eager guests if the baby-to-be is a girl (pink) or a boy (blue)! --Best gender reveal idea I've seen.
Bowls made of confetti! Great recycling art project--save all those leftover paper scraps (put in small bowls at each table). Collect a bunch and have the kids cut them up; Then make bowls made from confetti.