I just found this website for ID tags and they've got a lot of cute ones......
http://www.blingbling4pets.com/index.html
http://www.blingbling4pets.com/index.html
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You really need to be careful with these and make sure they are not to big, before you let your dog wear them.
Aztec had one very similar (not from this website) that said "King" and was in the shape of a crown.
Aztec was laying on the heater vent and the tag got stuck in the grate. When he tried to stand up and dragged the grate with him. I hear him yelping and ran right in to see him trying to run stuck to the grate! He managed to knock the tag loose so I took it off right away. I told my sister and found out it had happened earlier that day and she figured it was a fluke! Aztec still avoids the vents.
Anyways, the point of that ramble is to make sure you get tags that don't have to many prongs off them (like the crowns) or hang down to low. They could just as easily get caught on bushes, crate fronts or who knows what else! I would stick with the hearts and bottle caps.