QM, I am giving your suggestion serious consideration!!
Meanwhile I've been mixing and mingling all the orphans and hoping they will become one big happy family.
This photo is where they have set themselves up for the night so I'm going to let them hang out for a while and see how they go. I have lots of strip set pieces to fill in the blank areas; they can be cut to width as needed.
Of course there's always the option of adding one background color to sash and join all blocks which would calm the whole thing down from a riot to a town meeting. But then, sometimes I kinda like a riot going on.