Originally Posted by
toverly
I would echo a single line about a fourth of an inch around each tractor to stabilize those blocks and make them stand out. Then cross hatch the plain squares to stabilize those. I think you are right about not upstaging the tractor blocks. By adding a quilted line you are enhancing them not detracting from them.
I like toverly's idea, but to add a bit of color and a defined border, perhaps a stitch down of regular sized rick-rack between the blocks and possibly a larger size rick-rack of the same color at a strategic point in that large border. It's pretty plain to me and needs more color and definition.