Marrying a Timelord comes with its own set of risks.
They show Adult Swim Bumpers at DragonCon on all manner of geeky sci-fi and fantasy material. However I made my own, and showed it to my fiancee in a packed ballroom of 2000 cheering Whedon fans at a Doctor Horrible event during the intermission. Then put the ring on her finger on stage as the crowd literally went wild. Now to do the Gallifreyan Doctor Who Wedding next year...
I was bored and made this. Its a Police Box based ring with a tension set 1CT Princess Cut center stone. The three round stones is the Police Box sign, the two sets of four baguettes symbolize the windows, and a small princess cut below that to symbolize the instructions found on the front of the Police Box.
Wait, wait, wait. You were bored and you made this? I'm not usually one to encourage idleness (in other people), but please run out of ideas again sometime soon!