More to explore:
Quilting background fills.
by pinktext on Youtube
Free motion quilting how-to (with video!)
Love how these flow from one shape to another depending on the space to be filled.
LuAnn Kessi Sketch Book: Background Fill
I love how this turned out! Quilting made to look like tree bark, quilted by Judi Madsen. You can see this quilt in the American Patchwork and Quilting April 2013 magazine.
Scroll Fill by Karen Marchetti
▶ Sunflower Quilt Border Quilting Design - YouTube