Yeah, I bought some tribal graphics from
www.dawgscyclegrafix.com, see my sig pic... I'd recommend them to anybody. I didn't think of it till later, but if you were to wet sand the surfaces first then apply the decals and put a few coats of clearcoat over them, you'd hardly be able to tell any difference from an airbrushed paint job.
An extra set of hands comes in handy when you apply them... It's not easy getting them smoothed out over the contours of the tank.