I don't really need tips in that area. I did work with the artery foundation and rise back when I was 19. Now it's tough getting work for shirt designs and the process is a bitch. (Kill fees, clauses and major revisions on a design that wasn't given any real direction to begin with) I switched to show posters for a year and a half working with underground labels and local venues and bookers. Once cash stopped coming from that I did a series of posters for exploding in sound. A lot of the bands I worked with on that label blew up and now it looks good for my past client history.
But it doesn't pay the bill. I got enough experience and advice from the DIY folks and I'm going to move in that direction until something happens. I had some cool stuff lined up with some interesting folks here in the tf2 community, but now it's on the back burner until I spend some time getting my hands dirty at this new job.