After completing the MLB, MLS, NBA, NFL, and NHL Team Color Codes spreadsheet, I decided to the old and current minor league football leagues. The results are below:
Shades of Red
Shades of BlueShades of Gold
Shades of Gray
Shades of Green
Shades of Orange
Shades of Purple
Shades of Yellow
Shade of Brown
Shades of Black
Shade of White