i have some loyal readers who are rubber stampers. i assume they already know about rubber stamp madness. i saw this envelope on pinterest and can see that it is a perfect idea to steal. you'd have to love math a little bit. or you could do a very sloppy version of it.
that's what i love about stealing. you can be super sloppy and then i guess it isn't stealing - it's being inspired - or paying homage.
see those 7 rectangles at the bottom, the 5 middle ones could be the zip code.