When framing, I put the frame with glass, face down on a flat surface. I placed the mat on the glass, then centered the lettered burlap, front side toward the glass, in the mat opening.
I then put the black fabric piece over all, and re-installed the back of the frame.
These may be just a little too simple, and I might figure out something else to tuck in the frames to fill some of the blank space. The kids say they're fine, as is, so I'll probably be content to get used to the plainer look. I'm happy with the improvement, and the room is feeling a lot more put-together.
The furniture scale makes a big difference. We lost some seating by nixing the bigger sofa,
but the little ottomans that match the smaller chairs give us 'flex.'
They can serve as foot rests, tables, or easily-movable extra seating.