Are you looking for something along the lines of strips? Or some other form of sticker? One very cool looking black car I saw had like "phantom paint" (not sure what the technical term is) design on it. The color was j-u-s-t barely there.
I haven't done anything along the sides or on any painted surface, but on my back window, I have a mean looking goat that looks like he's fixin' to run, and underneath it, it says 'Got Goat?' (ala 'Got Milk?) That tends to get a lot of comments. I'll attach a pic when I get my regular 'puter back....daggom cable's been out all day so i'm on the laptop with dial-up right now.
leave the car plain no stripes just let the plainess of it give it its mystique look . if you tint the windows which i would have loved to do to my silver one but cant because you will lose your reception quality on your radio. just let the car speak for itself without the flash