Spigen offers a rather attractive looking ultra thin case for the Samsung Galaxy S3. The case is called Ultra Thin Air. As you can see in the below given picture, it is for those who want a case that does not adds much bulk to the phone and can settle with minimal protection.
I found the case to be too slippery for my liking and everyday use. The cutout for the lock switch is not at all well made and damaged it within couple of days. This is something I expect from a quality case manufacture. Nevertheless, it is a decent case but cannot recommend buying it.