I do try to be grateful for every gift I receive. Whether it's a gift card, or some handcrafted item. But....it baffles me that people think I want them to mail me pictures of their children. Useless! I just end up throwing them out.
Edit: Ah shit, my sister in law just asked for my address! I know this is what's coming, and I'm going to have to paste on a fake fucking smile like I just won the Powerball.
My Facebook friends get a pass on one (1) baby picture and if they keep posting them after that, they're history.
In your case, HappyCamper, I'm confident that your friends and family are well aware that you dislike children, and are mailing you pictures of them specifically to torment you.
Heck, send ME your address and I'll swing around and post a "Santa Lives Here" sign on the door.
Hey Camper, do what I do: Make yourself a discreet mugshot file of your relative pix, and update as they send you new ones. W/o going into details, it seems people get pretty upset when they realize you dgaf what their kid's names are, especially when you're related.