1 fat quarter (or scraps)
Some velcro (I used 3/4" width)
Step 1: Cut some 4"x7" strips. You can get 12 of these size strips from one fat quarter (assuming you have a crap load of cords you need to wrangle). If you have abnormally large cords or appliances, cut longer strips.
Open the fabric up and fold the edges back in toward the crease.
Then, fold back to the original crease and iron again.
Then fold the strip back along the original crease and top stitch all the way around the strip.
Wrangle those cords! Yee-ha!