I run workshops on making games for libraries. We scaffold the day so that concepts of play and games are introduced, then delegates work in groups to build a game prototype of their own. By the end of the day all delegates should have a prototype to develop further and the confidence to use these ideas to further develop games in their own libraries.
I've run were shortened versions of the normal workshop just for an afternoon too, as well as taster workshops for around 90 minutes!
Get in touch if you'd like a workshop running! I've run several now at individual institutions for groups of library staff, learning developers and other support staff and lecturers.
The feed below is from the blog associated with the workshops, http://gamesforlibraries.blogspot.com , where we post all the prototypes the workshop attendees create - please look through them and re-use the ideas if you can!