Arizona Cardinals

One thing I like doing in football concepts is modifying traditional elements in some way, and few things scream "traditional football" like Northwestern stripes (the thin-thick-thin stripes worn by the Steelers, Lions, Iowa, BYU, and namesake Northwestern, among many others).  Back in the late 90s, ESPN started airing Arena league games live, and among the AFL's top teams were the Arizona Rattlers and San Jose Sabercats, both of whom utilized Northwestern stripes in what remain the most distinctive manners I've seen, SMU's use of them on their shoulders notwithstanding.  The middle stripe on the Rattlers' sleeves was a turquoise/copper diamondback pattern, much like the Diamondbacks would later utilize, while a sunburst graced the Sabercats' uniform.

Arizona Rattlers courtesy azcentral.com