I added a link in the Sharing resources wiki to an article about an app for creating tracers and mesages - clues for students to find. Time consuming but creative.
I also like this idea about students creating their own questions http://www.ascilite.org/conferences/sydney13/program/papers/Parker.pdf and have a link or two for using Peerwise and the Moodle database. Just an idea or two to titlilate thought processes.