You might google cancer ribbons. Also, there are different colors for the different types of cancers.
I had always wanted to make one large quilt with a quilt block of a ribbon out of all the different colors to represent all the different cancers. Haven't done it yet, as I haven't had the time.
You could use a simple outline stitch that is sewn over a piece of fabric in the middle of a block. Then cut away up to the stitching. Or use the interfacing method and turn, then sew. Just a couple of ideas.
Good luck with your search for your quilt project. Keep us updated as you work your project.
Pam M