If you do a floating border, then that's pretty awesome. If it's just strips on every side, then skip the border, IMO

I checked out the shadow quilts that were suggested - I think I may try laying it out with some narrow shadows - to see if there is room for that. :>)

I have LARGE log cabin blocks for the sides and the bottom of the quilt (the log cabin blocks are 18") And there is a dark grey in that - so may use it for the shadows.