What do you hold on to after foster child leaves?

One of our FFD drew me a surprise picture saying "I love it here" in the hour before she went home. This is a kiddo I thought couldn't WAIT to get out of our home back to her parent. :-( I framed it and it's now in a place of honor. :-) Another of our FFD's gave me two pairs of earrings at different times that I cherish. I wear them when I'm missing her. You can imagine how devastated I was when one fell out. :-( And the child I was most happy to see gone made me a beautiful flower out of wood for mother's day. Even though I'm happy he's gone, I still miss the good days with him. His baggage was just... wow...