but some, like ronnie shephard, turn to other activities to fill their time. >> i remember first walkingy ronnie's cell and looking through the bars and seeing the paint all over the walls. and the first thing i thought was, well, this was different. of course, that sparked a conversation, hey, what's this about? >> i got bored just the other day, so i decorated and painted my cell different. just i wanted it to be red so it looked like the walls was bleeding, but it's black. it looks all right, too, though. >> after two decades in prison, shephard had less than three years left on a group of convictions related to armed bank robbery. he dreamt of opening a legit tattoo parlor on the outside while he ran an elicit one on the inside. >> this is pretty much the studio right here. it depends on what you're getting. if you're getting your back done, i have you lay down and vice versa, whatever. and i have a cell house job. i can take garbage bags, tear them open, lay them down for sterilization. >> ronnie had turned his ability to do tattoo work into a business. he had a list of clientele. h