Here are some easy-to-use desktop nametags or nameplates.They come 2 per page with a dotted cut line to show where to cut them. Or, you could fold there to make it a tent style nametag if you really wanted. While they can be printed in B&W, I highly recommend printing in color on card stock and then laminating for longer use.
Some name plates have a lot of fancy stuff on them, like numbers and letters, but those often have to be covered up during tests. These ones are strictly for show. They're cool, attractive, and don't have any hints or stuff on them.
Put your kagan cooperative learning seating numbers right after their names!