Another option, something I'd like to do eventually, is for a family in my neighborhood. They have six kids under the age of 12, and the dad was recently called to serve in Iraq. I wanted to make a memorable portrait of each of the children, and give them to the mom so she can send the pictures to her husband. This would be very heartwarming for me, and hopefully for the family.
I might just try both options, but we'll just have to see!