Personalization is something most of us love to see. I haven't often gotten them, but personalized Christmas cards with photographs and such have been most fun to receive. There's something about getting a card with a friend's photo on there that gives it an extra zing.
I also like photo postcards. They really make it special. One of the ways is to pick out that favorite vacation shot and then put it on a postcard and send it around. I did that once, a long time ago.
Okay, I'm a sucker for the personalized things, be it T-shirts, pencils, or postcards. We're so commercial today that when something can add personality to a communication, I'm all for it.
As for my dog stamps, I plan on keeping at least one just for the fun of it!