Not a real pattern, but what I did for myself was to just take the colors of my favorite football team and crochet.
I can't see it but I think I went 2 skeins of blue, 1 skein of orange (Da Bears). Then I worked in blue until I was half way across and worked that much more before going back to 1 skein of orange and 2 skeins of blue.
You could also break up the secondary color to match the number of stripes on their jerseys.
If he's a sports fan the colors of his team should be enough.
If it's a simple emblem like the Bears "C" you could cross stitch it on.
Petroleum based knitter, removing that nasty oil from the ground one skein at a time.