I have recently played a bit with a really simple technique in Photoshop that produce very cheesy results. As you can see above. The principle is simple; you take one nice pose (photo or drawing, it really doesn't matter), gather some brush strokes (not too complicated, and preferrably with a decent resolution), some more complex filler shapes (experiment) and some ambient background shapes (smoke works very nicely) and free transform outlines and fills piece by piece until satisfied. See video:
This is really so easy compared to the awesomeness of the result, I thought I'd better make a tutorial of it. It's a good way to start getting to know the layer effects in Photoshop, because the result here opens for further play and experimentation. But 'nuff talk, let's get down and dirty!