Design couch: treat or trick + MMQ part three

It's a Design COUCH! not a wall!! I even managed to keep the felines away for five minutes! Of course, food was involved...

Part Three of the Modern Mystery Quilt is back to rectangles. Does that mean part Four will be circular again??? who knows, thus the mystery!
Eighteen blocks: 2.5-5inches by 14-18 inches.

TRICK OR TREAT:

I haven't decided what to use for the binding.
I will add a photo once it's on the wall later this week.