One of the first things artists learn at art school is to design and print up a bunch of business cards to hand out to editors and publishers. Being cheap and eccentric when I launched my comics career circa 1980, I decided to save on printing bills by hand lettering and coloring a bunch of cards with Dr. Martin dye laid down with an airbrush. The trick worked too! People in the field that I gave them to immediately recognized they were hand made and remembered me.
This last surviving example is a bit worse for wear having been push pinned to the walls of all the various studios I’ve worked in over the decades.