Yeah the random generator isn’t that random with that few of images. Displaying them in order isn’t that difficult. I will add an option for this. Thank you for your feedback, I am working on the css atm.
I have added an option for displaying random photo’s or in order. Go to ~/MagicMirror/modules/MMM-RandomBackground and do git pull. Then add this to your config, randomOrder: false, Set it to true for random order.