This is the Doctor's Secret Name design (whoever's name it turns out to be!) as seen in 'A Good Man Goes to War' on the side on the Timelord cot.
Planning on having it down the side of my left calf to compliment the Time Lord seal on my right calf: [link]
This design is an inverted-colours version of this: [link]
Any changes you think I should make?
I'm sure the original design belongs to BBC.