You can use a sticker kit. Tape works and some cool stuff. Alot of it is late 80's/early 90's stuff that they never stopped selling. But there are some nice kits. They are pretty cheap compared to getting a factory kit. Use your imagination and you can use the universal kits for something unique.
I thought of doing a subdued flame job on my bike w/ the reflective tape they have. Then again, isn't there enough flame jobs out there? The other thing I thought about doing is an urban camoflage with reflective colors (white, silver, black). I never got over GI Joes. My dad keeps telling me that the when a car turns left in front of me they will blame the camo job. I think it will be perfect for my combat tourer/commuter.