Much like the cabinet in my dining room, the bookcases in my home office are dark wood with a dark back panel. I love these bookcases since I have a fair amount of books (I just weeded through them and donated a bunch to the library) and photo albums that need a nice home. I thought that I needed to lighten them up a bit and I didn't want to paint them or the back panel. I decided to make panels that would go in the back of each shelf and cover them with paper instead!
As luck would have it the foam board was the exact width as the larger boookcase so I just had to cut the height to size for six of the boards. I measured and cut each foam board and armed with the adhesive and paper headed to the basement. (*I used Elmer's Craft Bond spray adhesive since it allowed you to reposition the paper as often as you wanted. This was key with getting rid of air bubbles.)
The finished shelves:
A close-up of the paper:
Total cost: $12 for foam board and $6 for glue = $18