How about a functional (not-)sonic screwdriver?
I had seriously been considering investing in a good screwdriver set for my own personal use. (What, you've never had that impulse to fix or take something apart before?) This is probably not the most practical route to take, but I want to have fun during my utilitarian moments, gosh darn it!
For those of you who spend more time with you purse or car than cooped up in your room tinkering with stuff (*cough*), you can also get your sonic screwdriver fix in flashlight form. They also made a Tenth Doctor version, for those of you Whovians still hung up on Mister Shakespeare