Well ... why not consider a good-sized square in a square so that the NFL piece for all the different teams - - each square would be highlighted by a contrasting color of some kind.
How many different teams are there? Maybe 17?
I just received some pieces from the hmmm ... Raiders (black and silver/gray)? Is that the one?
I would be more than glad to send some to you ...
I will have to tell Amma about your thread. Maybe she could show you some interesting settings for that type of theme.
I would guess that you would need a good sized square ... consider different fabrics for the side triangles ... and maybe a bit of an intricate sashing ... just to add some intrigue and size to your endeavor ... <wave>