I'd put a narrow border (1 inch finished) of the dark red/rust to frame the quilt and put a wider border of the light green and bind it with the dark green... or put the dark green as the border after the narrow red and put the light green as the binding... :)
I wouldn't make the last border any wider than 4 inches finished...any wider and it would dwarf the quilt center. (only my personal opinion) :)