I would use the panel with the 4 pictures as they are in the center of the quilt and surround it with solid black or a black batik and quilt it with a brown thread. That way the panel is the center of interest. It is the only thing that your brother will be interested in anyway - not block patterns, etc. He will have a quilt that is masculine and built solely around what he likes. I think it will be very striking in its modern simplicity.