I made a fridge magnet from one of Renosis's Key Chain Fobs (http://www.thingiverse.com/thing:8511) There is at hole in the middel of the model where you can put a 10x10x5mm magnet. just add a pause in the g-code just before the layer that will bridge over the hole. put the magnet in the hole and restart the print. i also added a pause to change the colour from black to red just before the rebel emblem. unfortunately I don't have any pictures of it, I gave it away.