kids designing class

The project objective was to give young children (ages where 10-12) a chance to actually design there own 3d modules.. i know it sounds dull but it was awesome..
I took a small simple open source stl (maker faire robot)
15 minutes explained what a 3d printer ,designed in front of them some random thing to add to the module (for example)
told them that they can do what ever they want
put them in a room with computers for an hour and half. truthfully I did't expect it to work so well got a