A holder for the USB cable used with an Apple A/C - USB adapter, at least for the bulkier style connectors.

For a holder for the slimmer, smaller connector go to http://www.thingiverse.com/thing:13718

Print, push onto adapter as shown, wrap.

If you can't get the cable to end at the right length for a neat tuck of the plug, try reversing the direction of the wind or of the holder on the adapter.