Here is the border fabric I'm going to use, it reads brown but has a lot of color in it.
I am leaning towards a redish brown inner border like the darkest color in the border fabric to keep it neutral or go more colorful with a blueish green inner border. It will all depend on how the dye session goes.
The picture on the left was done without the flash and the one on the right with a flash to show the blues and greens in it. It is amazing how different the same fabric will look with different lighting.