I have read somewhere (on a China adopt blog) that disposable cameras are a good idea. Not sure about that one though.
So far I am thinking: baby blanket, stuffed animal/rattle, small photo album of our family and house, and a few laminated photos hole-punched so they can ziptie them to his crib (thanks TH for that idea!).
I realize we may never see any of these items again, too, so I am not sending anything irreplaceable.
And he is only 15 months old, so he may not understand any of this at all. But we can try!
I have been sleeping with his baby blanket every night so it will have our scent. That sounds really weird but maybe I won't be completely foreign to him when he sees me for the first time on Gotcha Day!