As suggested by this lady and this lady, our family decided to join Compassion's Christmas Card Drive and decorate holiday cards so they can be delivered to unsponsored children around the world. I went to Michaels and found packs of Christmas cards in their sale bin for a $1, and they also had huge packs of holiday stickers for a buck. My kids were super excited to decorate with stickers and draw holiday pictures, so we were all set to make as many cards as our hands would allow.
We had a blast and can't wait to mail them to Compassion so they can be processed for the holidays. We're gonna try and do another batch or 2 before November 30th. We're on a mission!