Hello! You are so creative! As for the backs of heads pictures, I'm a teacher and that seems to be all I get of my students, especially on field trips!

I just tell parents that there's a reason I didn't get into photography for a living!
I'm a little late here, but we give our boys (8 and 5) what we call "lost cards" to put in their pockets. They have our phone numbers and address on them. I got a bunch of them printed up for just the cost of shipping ($3 or $4, I think) from the Kodak Photo Gallery -- they have a great Disney picture on one side and the info on the back. I also use them as luggage tags inside each of our carry ons and suitcases. I didn't have them last year, so for that trip I just wrote the info on a small 2" by 3" card and laminated them. Both boys love cargo shorts, so there are always tons of pockets! They know if they're lost, they can show the cards. My DS 8 knows the numbers but I make him carry one just in case he panics. I know parents who give them to the hostess when they drop their child off at a birthday party, too.
The cyst sounds scary. My DS 5 developed a problem with one of his lymph nodes under his neck a few months ago. He had an ultrasound and a CT to rule out the nasty possibilities, so now the ENT has us doing "watchful waiting" to see what happens. We go again next week, and I'm hoping he gets a completely clean bill of health. The thought of surgery on a baby (even when they're 5!

) is scary, especially if it might interfere with nursing. Good luck!
ETA: The cards are called Mommy Cards, and the first 50 of them are free.