My advice for what its worth is keep it simple and think of the three places its going to be, your shirt, your van and on paper. Consider what it will look like on all three.
I got a fantastic logo designed and on paper its the business but on my shirt and van its losses its sharpness. Its 3D with fading. I posted it a while back. Search if you want to see it or let me know and ill try and post it again.
Mark