Lol, I think it was more him thinking that they're so obscure and his weird Mom loves them, so surely this professional will never have heard of them.
He was tickled that she did, let me tell you.
If you have a program like CreataCard you could c/p and then print up stickers, magnets, cards- whatever!
Good idea- I also like the one where they're stretched onto the buildings. They're all pretty cool.