I ran a great teambuilding workshop for Southwark Volunteer Centre. From the blurb:
Spray painting is new to most people, consequently this workshop offers opportunities to overcome fears and try something new. Technically difficult, spray painting is an art that requires concentration and patience. Materials are expensive, so working in groups is necessary. Groups are required to come up with designs together and then paint them as a team. Communication and people skills are required for a successful outcome.
And we got some great feedback too - people felt they had fun, learnt new skills, and that those new skills would be useful to them. We even had an outbreak of spontaneous dancing!