I am currently in a round robin and something like that would be a wonderful center. I usually don't do sampler type quilts, I joined this round robin to stretch myself and let me be less planned and come out with a top that is nothing like my usual style.
So maybe think of it as your own personal round robin, give yourself a month to do a border of some sort without fully planning it out but seeing where each one takes you... "if I got this from someone else, this is what I'd do" sort of thing. It's a good way to incorporate something maybe you've always wanted to do but didn't want to commit to for a full quilt.