I had two brown 5x1 Expedit Shelving units. I painted them white. Took out 2 shelves from each unit. I turned them horizontal and laid them flat on top of each other. I went to Home Depot and had a piece of MDF cut to size, which I stenciled and drilled holes in (for hiding av cables). I attached this to the back and voila! For added classiness... I installed IKEA under-cabinet lights on some of the shelves.
I especially like the addition of the back panel for not only hiding the cables and wires, but Sarah's addition of a wallpaper finish to add an element of style spotlighted by the under-cabinet lighting. The spacious shelving somehow makes each component seem like a stylish element rather than a bunch of black electronic boxes when illuminated as such!
(Image: Sarah Quickel)