This set of links is bookmark worthy. It’s a collection of useable resources for group building, team building, or youth group activities. I learned about Samoan Circles from the DoT link below; it was a fascinating surprise and an interesting type of group process. I’d highly recommend visiting the DoT link.
Teambuilding for Resident Assistants
Icebreakers from the Source for Youth Ministries
Group Techniques (interestingly enough from the Department of Transportation)