are you looking for big girl projects or things that the kids can help with?
A heart wall hanging is always cute!
here's a pattern:
http://images.google.com/imgres?imgu...%3D21%26um%3D1
or making one of those tissue paper acordian like hearts would be cute too. You fold a long strip of tussue paper up like an acoridan and then cut the the bumps for the heart at the top and the v at the bottom (making sure you keep part of the sides intact) and then open it up... the hearts should all still be attached to each other.