After Apartment Therapy linked to my previous post, several people commented and emailed regarding a how-to. While written step-by-step instructions would be tough, I do have photos that I took along the way that may be of assistance. For anyone interested in trying something similar on their own walls, below are the project pictures I could find on my camera.
Step 1: Using a diamond-shaped paper template, I taped up the background grid which I kept the original paint color that was in the room.
Step 2 and 3: I taped off the left side of the diamonds and painted these blocked off areas white.
Step 4 and 5: I taped off the right side of the diamonds and painted these blocked off areas tan.
And that's it! It actually wasn't terribly difficult; just time-consuming.