The 2 books i use are "In the Beginning...Creation Stories for Young People" by Edward Lavitt (OOP) and "In the Beginning Creation Stories from Around the World" by Virginia Hamilton. That one was a Newberry Honor book.

I like the Lavitt book b/c it's broken down by continent - Africa, North America, south America, Oceania, Asia, Europe, Middle East, Greenland, and the West Indies.