Look below for a few case studies that will help you if you are having trouble choosing a topic.
Each case study has an introduction, shows how long and how difficult it is and has a link to get you started.
As a group you could research all these case studies, draw up a short list, and then get together to decide which one/s would be best for your group.
You can then register your choice on-line.
First come first served!
Good luck!