It occurred to me if I worked ahead on my birthday greetings, it would be a good way to use up stamps. I started with my go-to markers the Faber Castell PITT Big Brush markers. In the lower image, you can see how i just filled the space with fairly wonky letters. There is a piece of Post-It tape across the envelope. Peeling it off left an open space for the last name.
Then some outlining.
I could get carried away with additional doodling. Hopefully it is obvious how you can turn sow's ear lettering into a canvas bag. It is not a silk purse, but it is quite functional.
The address will be in the space between the two chunks of red on the Y