Well, this worked better than expected...

 The final project for my cine class is to emulate the aesthetic of a randomly assigned painting.  One of my students was assigned "Wanderer above the Sea of Fog" by Caspar Friedrich:

We were brainstorming ideas on how to emulate the dynamic background in camera without actually standing above a sea of fog (which BTW is possible on a predictable basis about an hours drive west of here...).  I remembered this:

 

http://www.diyphotography.net/diy_create_your_own_bokeh

I thought if you could make the bokeh look like stupid hearts, why not something more useful to the story?  So instead of a heart shape, I made a slit (135mm Kmart lens f2.8 on a 7D):

Here are the results, before and after:

Here it is in motion.  Forgive the shaky footage, I was handheld on a 135mm...

Blogger embedded video is pooptastic. Here it is in better quality on Vimeo:

slit bokeh test from cinejay on Vimeo.

Not bad for a quick test (the blogger playback doesn't do it justice...)  I told the student about the successful test.  If he decides to incorporate the technique I'll post a follow up...  It gives me lots of ideas on how to take it to the next level.  If this technique inspires you on a shoot then let me know, I'd love to see the footage.