1. I find the Sultan Tughra to be an intricate and suggestive form. It is often stamped on antique ottoman works of better quality. (see the photo below)
2. The signature in cartouche of Assad Allah of Isfahan the legendary persian blademaker. I find it the most appropriate for an islamic sword collector.
KLIK
Well I also want my second tatoo (I have a japanese dragon on my right shoulder) but I'll decide from the two mentioned above.
As Radu mentioned it before, do not paint on your car any of thoose symbols uneder any circumstances. Some people feel a real genetic anger towards them
Go on Sabertasche, as we Slovans use to say, if you do that at your 45, you're a Tsar.

Anything you choose, please attach some photos when it is done!!