A.W.
You could cut and fold and make nice "thank you" cards out of them.
I use the fronts of Christmas cards that have pretty pictures on them (and no writing on the inside front flap) and cut them into circles or squares, hole punch and tie on as gift tags for Christmas gifts.
Depending on the size of the image, you could cut out and make bookmarks, hole punch the top and tie on a yarn tassle.
Wrapping paper?
Get a wooden box (craft store?) and decopage (sp) the pictures on it for your child.
Frame them.