Have you seen the Nerd Nativity created by blogger Designer Daddy? It features Wonder Woman as Mary, Captain America as Joseph, Alf as an angel, and as baby Jesus -- plus a baby dinosaur, naturally, and all on a small cheese plate. It's kind of perfect -- and about as kid-friendly as they come.
When I was growing up we had a beautiful nativity created with trees, moss, and these beautiful Italian Fontanini figurines. But when I grew up I went for something slightly less reverent -- Playmobil. Yes, they make a nativity, and it is awesome. But if you're crafty like Designer Daddy you can come up with something even more clever. Here's a few cute, silly Christmas creches you have to see.