So I went ahead and invested a whopping 7 krona in a collage app. I've wanted to play with photo collages for a while, they are so handy to show several aspects of something at once. Or show all the stages of one project in one image.
This is the first experiment. Not too bad, but there is room for improvement. The next time I'll make the frames white to begin with, and try to choose an image where Sona's butt is not prominent while the rest of him is cut off. I see many happy hours of experimentation ahead of me.