Here are some updated images with the color on the back of the jerseys as well. Some will be harder to do as they have two colors on the shoulders. I think these definitely look better.
I'll probably do some African countries as well. I have a template now and most of these go fairly quickly...but some flags are harder to fit onto a jersey. But one of these days I'm going to have to actually start playing OOTP rather than designing logos, uniforms, etc.!