Need a car-friendly way to listen to music?
Go download PowerAmp.  Best $5 I ever spent on an app.

It includes lockscreen controls and I'm pretty sure you can set up lockscreen gestures to do whatever you want.  I'll confirm this real quick on my installation.

Edit: Confirmed on the lockscreen gestures.  Swiping left and right over the album art will skip the track forward and backward by default, from anywhere in the app or on the lockscreen.