My current business offers products to NFL fans via my website. I want to customize them to match NFL team colors. Obviously, I cannot advertise my product is a Minnesota Vikings widget, for example, that comes in purple and yellow, without agreement from the NFL and/or the Minnesota Vikings. At least I don't think I could. But could I direct customers to select their colors based on the city or state of each NFL team? So if you select Green Bay, my product would come to you in green and yellow. And if you selected San Francisco, it would come in red and gold. I want to have an interactive map for customers to select their team without actually saying Packers or Bears or Colts. If I do this, do I run the risk of getting sued by the NFL for trademark enfringement since the colors are obviously associated with the various teams? Thanks in advance.