I took my display down this weekend. After rolling one extension cord by hand being careful not to twist the cable (yes, I am picky!), I realized it would take me hours and hours to go through all of them that way. No time for that so I made this home-made rolling device...
tape one end on the side of the bottle and start rolling! a few seconds later you have a nicely rolled up extension cord. Just slide it out and it is ready to store. The one on the picture is a good 50 ft long.
It may not be fancy but it saved me hours of work and all extension cords are neatly rolled up.
... and if you do not think I am crazy, my kids sure thought I was when they saw what I was doing!