I am a big fan of NFL.. but I do have a favorite team.. So I thought I would add my two cents just in case it might help.. The main colors to the NFL are red, white and blue.. If you go to their site you find their logos.. Might make a nice center piece to your quilt and maybe you could use those as a main color.. What is your sons favorite color? I don't have any NFL fabric or I would try and help out there.. That is my two cents, I hope it might be helpful..