This video by andrehogbom provides instructions to make a Gingerbread Marble Run.
Every year we do a Gingerbread house (yes everything you see is gingerbread, except for one piece of spaghetti). This time we went quite far by doing some kind of kinetic sculpture and it's more obvious than ever that gingerbread isn't the greatest construction material out there. The same goes for chocolate marbles. But nevertheless we got it together and had fun while doing so!