By chance on that magical mystery tour that is the world wide web, I came across a photo editing site known as pixlr. Wow, in no time I can make collages, quick grungy edits that look different from my standard way of doing things.
I used various graphic files that were variations on a theme (japanese optical art) and brought them together as one. Most of those files alone were not strong enough to make an impact but when combined together they work better.
A visual example of the adage ‘sum of the parts are greater than the whole’.