How about a variation on what was suggested above. A table of true scraps and the challenge is to make a 12.5 block that uses (Blank) number of fabrics or (blank) number of pieces.. End result, a donation quilt of many colors and different blocks. A variation would be the colors are all monochromatic and one contrasting color.
Honestly, personally I would avoid this kind of activity at a retreat because I come ready to work on my own projects. I would move this kind of skill challenge to a guild activity that could be completed over a month or two. Each guild and retreat has a "personality" so, honor your guild's personality and have a wonderful time with all your quilty friends.
Last edited by WMUTeach; 02-12-2019 at 04:11 AM.