Stash Bash ... everyone brings a set # FQs (or could be any size) from their stash. Turn them in when arrive. Someone sorts them into groups of coordinating colours or types (eg. all novelty prints). Each person gets a new bundles to take home.
Mug Rugs! ... many haven't done one, though they've heard of them. Could do a mountain of them and give them away for charity.
Mystery Quilt Project ... doesn't have to be a huge quilt. If you're wanting small, what about a table runner? wall hanging?
Bag/Tote ... everyone needs another bag, whether a market bag, tag-a-long, or more purse-like