Here are a couple of mock ups that AgapeStitches put together for me. Which do you like? Or should I do it without sashing?

I like the red the best. I love the block itself, very beautiful.

I personally like the red! IMO, the black has nothing to tie it in with the blocks. White would be my 2nd choice. Seems to me the blue dulls the quilt too much.

Edit: I wonder if a slightly narrower sashing would make a difference? Seems to me that the sashing width almost overpowers the very intricate blocks. Maybe a red sashing width more in keeping with the width of the red in the blocks?

Nice, red or white

red

Black or Red sashing look the best IMHO. what pattern is that? it is very striking & I like it!

If you're going to use sashing, I'd agree that the red is the best. But I think the blocks are super without sashing as well. Maybe a compromise -- cluster the blocks with 4 together, then sashing in between those large squares.

This block is amazing. How many pieces are in it anyway? How many have you made? You are dogged, Mamma!

IMHO I would love to see the secondary pattern develop without sashing. I love the red sashing and I would use that as an inner border. However there will be as nany opinions as quilters so do what makes you happiest.
Rita

I like the blue, red or white... not the black
Beautiful block!

i vote for the red