Yay! I'm so happy it worked for you today!!
The easiest thing is probably to frame your "pictures" to match the pattern size. Maybe there is a coordinating print? I've used grass design fabric before with sports fabrics, or maybe a black and white soccer ball print might work better with your panel. I looked some but didn't see the custom name fabrics any more on the Joann website, but maybe from another place like Spoonflower or other company. Of course, that would add both expense and time.
From what you described of your panel, they might be rather small for that to work well. You might want to include them as the center of a star block or more of a log cabin multi-log frame.
I would probably avoid changing the framing divisions (corner squares) on the pattern. Am guessing the pattern is made with 10" squares and maybe 1" for the black. But, you can break down the size of the white space between the black frames to be equal to the size of the squares.