Ben, your help is required.
After a fatal crash with the TARDIS the Doctor's Sonic Screwdriver broke as well as the Automatic Sonic Screwdriver assembling system and the Doctor needs your help to create a new Sonic Screwdriver.
What I am suggesting:
Design and Build your very own Doctor Who Sonic Screwdriver with cool Features and epic effects.
Well, that's all there is to it.
I personally think you could add features like
-Rotating Parts
-Cool Light Effects
-Cool Sound Effects
-A Unique Charging Station
...
So all in all a cool, individual and unique Tool for Wibbly Wobbly Timey Wimey...Stuff