Our family is super blessed to have a lot of missionaries out serving.  In fact at one point this year there were seven names we had to remember in our prayers.  For what ever reason this is a great night, we write letters to the missionaries from our ward and our family.  I think  of something small and clever ;),  to send them and we wrap a whole lot of love into it and send them on their way. 
This is the clever part, get it, "open your MOUTHS" and we sent mints.  I thought it was so smart, (I know small things make me happy).
I know how much you can miss home, especially at Christmas time.  I hope this helps them to know that we are thinking of them.