It's taken me three months but I've finally finished all of the window films in the computer room. (See here and here for the other two windows).
For the double window I did kind of a mirror image sort of thing, with randomly patterned thin lines and dashes. I'm really pleased with the outcome (though I'm even more pleased to be done with it--it's a bit of a tedious process).
Now we can play air guitar to all our records with a bit of privacy.