Graphics for PCB based panels are a simple way to get it done. I have a tutorial on how you can make your own panels in this way in the thread below:
Personally, i think the market would lean closer to the design of art assets that look good with only 1 bit color information more than the actual production. Since the process of screen printing and producing these panels is so easy, anyone can do it.
Check out @d42kn355’s panel blanks for a good example of what can be done here. They even used the other layers to get more complicated designs/colors.