Okay, this is brilliant. Canada Post will create customized stamps. You pick the template and upload your photograph. Imagine sending out letters that have your book jacket on the stamped envelope!
They’re a little pricey — $ 14.40 for a package of twelve but I can see where they could be worth it if you had a postcard (like the one John Connolly uses to market his books, for example). Here’s the link!
Update: After posting that this morning, I got a tweet from a Canada Post rep who pointed out the prices come down the more stamps you buy. Very effective marketing!