Can I use a pot to turn a stepper?

Can you hook up a pot or something to turn a stepper manually. Almost like a speed controller for a dc motor. If you turn the pot one way it speeds up in that direction. If you turn the pot the other way it speeds up in the opposite direction. with center of the pot being stop? Not using a pot to turn 1 rotation like all the youtube videos i see. I want it to keep spinning.

Any ideas? I might have to just lose the stepper and go with a brushless planetary gear dc motor and speed controller. But it's expensive! and I already have the stepper and driver and arduino all set up!

Yes that's a simple thing to do. Have you seen:- http://www.arduino.cc/en/Tutorial/MotorKnob to get you started.