How valued is micro art today? Stamps are such that one must have one to mail something, so why not pick one with a pleasing aesthetic? I'm working on a side

How valued is micro art today? Stamps are such that one must have one to mail something, so why not pick one with a pleasing aesthetic? I'm working on a side project centered around graphic art containing varying subject matter aimed to be used in a similarly nuanced way as mail art. I believe this idea is even more applicable in the digital world as graphics are more readily available than artistic stamps.