Any advice on what to give a family celebrating the adoption of their daughter through foster-to-adopt?

Long story short: The adoption will be finalized soon and they are having a party to celebrate. We'll be out of town, so I'd like to send them all a little congratulations card/gift. They've fostered the little girl since birth, so it's not like they need baby supplies or anything like that - any insight on what's appropriate to send?

ETA: The little girl will have just turned 13 months.