Cease and Desist maybe, if you spelled it Cease with an S?

I was reading through all this trying to determine if I have the right to trace artwork on a playfield/backglass and reproduce it on a shirt/mug. Not a blatant copy of the artwork, just a simple line sketch. For example, the outline of the car (no shading or high detail) on the High Speed backglass. It would be recognizable to other High Speed fans, but pretty subtle otherwise...

Thanks Matt for your thoughtful response. Yeah, it's not like I am even trying to make money, right? I just want to make myself some awesome gear to use/wear/share since it's not available. I guess what I was looking for was, what are the rules? Where is that line? How come the guys down at the mall can sell sweatshirts with a mickey mouse outline on it, even though it's clearly not Disney official apparel?