Here is an other challenge: "No fear from competition"
Under this topic was a challenge within a group of beadmakers. They showed their results on the German beadmaker's symposium in Wertheim some years ago. The reaults were really interesting and quite different.
What they did: They choose a color topic and a time limit per bead. That helps to keep the work managable for everyone. Each participating beadmaker makes two beads for eatch beadmaker in the group. Next step is a "classic" beadexchange so all beadmakers get two beads of each one in the group. The last creative operation is making jewellery by using all beads from the beadexchange. Bring the results togather or trade photographs! This might be a good idea for a group exhibition.
The original topic was "Use black, white and crystal" and the limit was about 15 minutes. I think they where about 10-15 participating beadmakers.