You match the backing? Don't that cover up the design of front?

I see lots of orange - except in the white area - I'd change to a white thread for that area.

Don't know how much work it would be, but I say go bold and use contrasting color thread for each section.

+1 :)

and Buckeyes.

By the way, to answer your question, you can change with each block row and it wouldn't be that big of a deal. For instance, for the Browns fabric use a brown or an orange, for the Tribe fabric use a navy , the golf bags --a green.
Your quilt design would be easy to quilt by sections of color/ fabric.

i would use a variagated thread for the dark and probably change color for the light section.