I really like this one from Anthropologie a lot.
I think I saw a very similar one at the Free People store the other day, but I cannot find it online.
Anthropologie "Lithographic Necklace"
$32
6/16/2010
I found a very similar piece in the U.O website.
I wonder which one is better...
Urban Outfitters "Circa 78 Wildflower Necklace"
$38