Another ideal gift would be to become his companion, though my recent introduction to Firefly has started to mess with my Who mindset (and the combination of companion!Amy and kissogram!Amy has taken on a whole new meaning...). Anyway:
My friend and I had a conversation regarding David's and Matt's respective puppy-dog eyes. We decided that David has the best all-out big dark puppy-dog eyes, while Matt has eyes of the try-uselessly-to-cover-it-up sort. But no matter what type he has, it was still very hard for me to pick a screencap for this:
I won't hug you now, Doctor, because you were enduring intense huggling from the moment I saw this.
In some cultures (e.g., hobbits) the birthday boy/girl gives others presents. I'm not of those cultures, but here's another treat.