Forget becoming the next Dave Matthews. According to this interview, what John Mayer really wants to do is design:

MAYER: I'm actually into sneakers on a design level. I've got a big design thing going on in my life right now ... I love designing stuff. I mean, my biggest dream, forget Grammys, I want to be able to design an Air Max.

It's true! His blog is full of designs, like this t-shirt, these bags, and the JMltd collection. And that little designer in him wants out:

"JMltd... Not really a clothing line - just a safe place to let my design head loose."

Let it loose, baby. Our body is your wonderland.