Inspiration strikes again! One thing I haven't mentioned with the Holographic Window Art is that depth is king. This uniquely suited 5"x7" picture frame is very deep. I picked it up on clearance at Hobby Lobby for just a few bucks.

Notice even in this 4"x4" inch frame depth between glass panes. Because of the depth, the imitation muntins dividing the glass panes act as cross hairs. This allows the illusion to have significant impact.

The back light is the other left over. Purchased as a pair, it is now providing excellent lighting to the holographic scene encased in the window.