If it were me, I would frame the photos with something like 'courthouse steps' because it's easy, (& I know how to do it). They will frame each individual photo like a picture frame so they stand out. The fleece backing you have is perfect! Just cut your blocks all the same size, add the frames, & then sew them together. I just made my own design recently because I had some nice focus fabric that I wanted to use. I used black kona cotton & it turned out really nice.