I think if tastefully done there are tons of EM's that would look great with toppers. People will shit on your idea and say it wasn't meant to have a topper, but fuck em.
A few pins that come to mind and an (idea for their topper):
Space Mission - (Shuttle Launch)
Fireball - (3-D LED lamp with same image as pop bumper cap)
4 Million BC - (Kick ass Dinosaur)
Flipper Pool - (Wooden Pool rack)
Thanks
Blake