You may be able to do something similar. If not, find some venture capitalists and make a lot of profit.
Here in the US, we can't print our own ourselves. But if you're willing to pay a little extra there are a couple of companies that are licensed by the US Post Office to print custom stamps. You upload your photos or images to their site, place an order, and voila! Custom stamps.
Or you could just print your own stamp-sized stickers, and put them on the letter along with the actual postage.
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