This Pinterest site has some interesting ideas.
https://www.pinterest.com/zaneyonequilts/quilts-guitar/
The board has a couple of Round Robins, one completed and an open one, that I have learned much from as far as adding rounds to a center and some even changed to other colors. Maybe you will find your inspiration.
2020 June through November Round Robin
https://www.quiltingboard.com/member-swaps-round-row-robins-f11/sign-up-open-january-june-2021-round-robin-t313479-4.html
Last edited by Barb in Louisiana; 02-21-2021 at 10:44 AM.