What do you hold on to after foster child leaves?

I take a bazillion photos and make scrapbook pages so I don't really keep THINGS though there has been the occasional favorite outfit I can't part with or find later and weep. I did keep my ffd's hospital bracelet because I didn't trust her parents with it after RU. SO glad I did because she came back into our care for a few months and is now being adopted by relatives. I gave the bracelet to them. :)