C.T.
How about a book swap. I went to a birthday party that said on the invite, "no gifts please, but for please bring a gently used or new book to swap with."
When we got to the party, there was a table were are the books (unwrapped) were left. Then halfway through the party, all the kids were invited to the table to pick a book to take home. Most people still brought gifts (I did), but you didn't have too and I thought that was a great idea!
By the way, I had 3 kids so I brought 3 books.