- Self-made cards
- Ad cards.
But come on, chaps - who wouldn't like a kitten on the doormat? Or a puppy? An innocent child, a beautiful flower - or a sweet card that someone lovingly hand-crafted? Why would anyone rudely and pre-emptively reject what is only intended as the kindest of gestures? When you look at it like that, it all starts to seem a bit silly, this snobbery about "cutesy" (their word) cards. Each Postcrossing sent to you is a little moment of friendship so don't be so darned fussy!
People also moan about multi-view cards. This is quite unpleasant because not everyone has a big selection to choose from in their local shop, and anyway, multi-views are nice! They show different aspects of a place so it's always interesting.
I must give the best "Do not send me..." to myself, however. "PLEASE NO NUDITY" was the message I had to hastily add to my profile after several German Postcrossers inexplicibly sent me nakey men. I don't know what the postman must have thought.