Primer Flat Matte Grey?

I thought while spray painting the hubcaps, aerodynamic wheel covers of the Prius; perhaps the aesthetic should just be towards Matt Gray, flat primer. What is the concept? With a primer, anything is possible. Therefore, perhaps the general gist and thought is towards infinite possibility?

For example in the world of painting automotive painting, typically you apply a primer before you apply paint. Therefore a car which is already sanded down, and primed is ready for any sort of paint job. The same thing goes with painting rims and wheels.

For example, let’s say that I painted my rims, or rim covers, all matte primer gray. Then in theory I could just go to the local AutoZone and pick up any sort of interesting paint, which I might think fun, whether it be red, shiny gloss red, matte red, orange, Neon green, pink, magenta etc.

But what if, the new concept was you always kept it primed? That, do you end up never applying a new sort of paint, but it is always primed, ready for something?