Wow, Judi - that is beautiful. Love the alternate layout, it really changes to look of the pattern.
I like the two narrow borders you have on now. If you want/need to grow it a bit, I'd either go with a pieced border - even something simple, like piano keys or 4-patches. Or something neither as dark as the darker brown, or as light a the tan/cream.
Thanks for sharing your wonderful quilt.