As a sign you have enormous reserves of energy. This can be presented in either a positive or negative way. Positively this makes you a very big achiever as you're literally driven to get what ever it is you want. This energy used negatively, however, makes you brooding, secretive, resentful and dark.
You'll fluctuate between these, I'm sure. But fundamentally you are very deep and mysterious compared to us other 11 signs! But as far as the latest popular art work on tattoo galleries is concerned, Scorpios are very good customers!
A sample of top tattoo designs around at the moment include:
Gothic
Egyptian
Tribal
Dragon
Cross
Star
Butterfly
Fish
Celtic
I'm sure that some of those will appeal to you. Of course there are thousands more than that to choose from.
Your own astrological symbol is the scorpion and many Scorpio tattoo designs incorporate this, as well as the astrological glyph (which is basically the letter M with a curled up last leg with an arrow head on it, symbolizing the sting in the tail!)
The latest tribal, Celtic & Goth artwork looks fantastic with this symbolism.
But, don't just take my word for it.