I have seen many friends mull over a post-bac, none of them have done it, many now have MFA's but all of them had an academic background in studio art. Without a BFA or BA major in Studio Art (aka "formal training"), artwork is considered naive. I am sure it has been done, however, trying to shed the "naive" label via an MFA is a tough route in a very tough field. A MICA post-bac could get you into schools you dream of, but it most certainly will get you into school studying art. There can be a lot of bs in art classes, but with that experience under my belt, I can at least know how to sort through it and how to produce in the academic machine; how to work my ass off for back to back 3 hour classes, return and produce for another 4-6+++ hours that night, get the most out of my crit the next morning, then wipe it all down and start again. I am not assuming that you don't know this but I have painted both in and out of academia and there is a real difference. Knowing and experiencing fine art classes in academia first hand is extremely valuable to success at the graduate level. I never thought I'd hear myself advising someone to consider a post bac and I have been resisting from replying to this thread because I don't want to sound snobby. With little academic experience in fine art, you could benefit from a post bac and your work will improve exponentially. Just the vibe of being in an art school environment will get you moving in new directions. I am no expert, so take whatever you want from my opinion: I have learned a lot from my profs, my mentors, my friends, and my enemies in art classes.
atb