I think I would do a stitch in the ditch of all the squares and then outline the different chickens. Either just inside the edge of the appliques or just outside. I don't know what it's called but I call it "echoing". basicly you sew a ruff outline of the applique about a 1/4 or /12 from the applique. When I learned applique, I was taught to make your stitches part of the charm of your quilt. Mine got appliqued with whatever color thread I grabbed out of the bag. Didn't even bother too look.
ETA--I wish I could find the picture of the quilt I made for my brother. It was appliqued on black. It had a "full moon" that was a circle of a wolf prints that reflected down below on the "stream" was a flowing wolfpack. The mountains, rocks and cacti were all southwestern prints. It had very little elements to it but it just popped! I used the "echoing" techinque and did it all by hand. The lines were about 2inches apart and eventually blended into each other like the ripples on a pond. I'll see if I can get a copy of it for you to see.