Cornerstone Conundrum

Here is the Breathe quilt laid out on the floor.  The pattern calls for cornerstones between the sashing strips.  I am holding auditions. 

You'll note the outer border will most likely be the black/gray print, probably not quite so wide as it is folded here.

First up is the yellow-gold.  The camera flash gives this combo a ketchup-and-mustard quality, though I do like it in natural light as it seems to pick up some of the yellow-golds in the apple and black floral prints. 

(#1)

Second (below) is my old standby, black with white dots.  I have used this many times before.  I hate to be redundant but it seems to add a little spark without making me want a hotdog.

(#2)

Third (below) is a gray on black print which doesn't seem to compete for much attention at all against the blocks.  There is a subtle difference between noncompetitive and dull, however, and I can't quite decide which category this falls into.  Alternatively, I could use the same print as the outer border, a similar gray on black whose effect, I imagine, would be much the same.

(#3)

Any thoughts?  Preferences?  Other suggestions?