I have a tattoo on my arm and it took months to find what design to have , i have flames going up my arm but i didnt want the same as everyone else so i tried to make it different, the way i done that is by just checking out tattoo sites on the net finding a good tattoo and just adding your own touch to it so its unique. A very good tattoo site is bmezine.com (and you dont have to pay for the pics). Worst thing is if you pick a tattoo from a tattoo artists wall in the shop, more than likely you will be sat next to someone on the bus and they will have the exact same tattoo as you how gay..
I did something similar but had a complete backpiece done. Took over 30 hours to do and hurt like hell but its looking cool so far ( well I think so)
I basically got a print of a angel from a tat website and used it as a base. Now I have a tat that NO one will ever have or be able to copy
-ChEf
edit: The pic in my sig is about a year old and it looks much better now!