My idea for a case is to have three hard cover books connected together (side-by-side) and the inside would be hollowed out. You could use regular blank hard book covers each a different color (like the example in the picture below). The middle book would have the power button, it would light up when on but should mostly be un-noticeable when off. The Blue-Ray drive would be on the front as shown and preferably it would be a slim one like in laptops. In the back would be the cable hook ups as shown. The overall width should be arround seven inches and probably the length too. I think that this would be a really good case mod because it could easily blend in on a book shelf and is a very creative.
Here is a basic drawing of what it could look like:
I included a colored example aslo: