This a variation on a folded paper CD/DVD sleeve I found somewhere on the internet. I made some additions and modifications to the folds and made it work for a standard letter size page.
Update: Instructables user boyhowdy has made a perfect pdf template which clearly shows each fold and outlines the areas for cover artwork. Also, the template clarifies step 6 which may have been a bit cloudy to some. You can download the files below.