So this is what I did when I was bored yesterday, but only got the little silver links to finish them today. They are a little set of robots who each have one half of one heart. The intention is that they would be bought for a couple and each would have one. I think they are sweet, I dunno that I'm happy with them. they are for sale in my etsy shop [link]
i could do one of these with just a silver ring finding to be put on a cord or something as a necklace, or could do one as a single keyring maybe with something else instead of the half heart. note me if interested