I like your theme idea! We weren't that organized, but one thing we did that I really am happy about was, in lieu of gifts, we asked folks to bring (or send) items for a "time capsule" that dd will open on her 21st birthday. We have enough toys for a small village (almost none bought by us -- first grandchild on both sides!!!) and plenty of clothes...so it seemed silly to get more gifts.
It also meant that folks could be creative rather than spend money...dd received newspapers, magazines, 2002 coins, stamps, videotapes, recording of current popular music, and other fun stuff that I imagine she will enjoy in 20 years...and the parents of the other babes in attendance really enjoyed watching the presents being opened!
Kim, momma to dd Tayte, 14 1/2 months old