So, I ran across the parallax barrier technology for 3D screens. This allows you to view 3D images without glasses.  It works by interlacing the left and right eye, and then restricting the view angle by using a row of slits.  The two columns and the slits basically end up making a sort of interference patter then when positioned right, allows one eye to get only one image.   The downside is that the view positions are fairly restricted.

I decided to try it on my ipod. It actually worked! Not amazingly well, as you had to hold it still in a particular spot, but with a higher resolution printer for the mask it might make another fun experiment. In the end, the front glass might wind up being too thick for practical use, but I have yet to try lenticular lenses.