Quandaries such as this would have me in a Photoshop type program, or multiple photo copies/color prints, to assemble more blocks, to see what the resulting pattern would be.
Isn't this what makes designing so much fun? After deciding on a block, or block set, comes sashing or not.
Personally, the colors, as they are, are striking. It may be fun to make a stack & whack out of the focus fabric for the center. I too will be looking for a finale on this.