Back in the days I used to set up a set of images as slideshow. They would be the same image but with the main color changed.
How can I produce a set of pictures with different hues with freeware (gimp/paint.net etc)?

I've even found the one I used (pic related) but I don't know how to search for the other images from the set. Do this kind of picture "sets" have a name?

Also, let's use this thread for good starting images that are nice to use in a different-hue-set