A weakness of this exercise could be that someone could easily recognise the image and produce the original image from another source. However; I have resolved this by adding a kind of insignia or message to the original image that will not be able to be duplicated without having unscrambled the image. This doesn't apply to the first two images because I didn't think of the issue until I had already created them, so for the first two we can just use the honour system.
Another potential problem is that the puzzles may be far too difficult or far too easy, seeing as I have no experience doing this and have no idea how it will work out. So we can think of this as a trial run and gather feedback as we go.
But anyways, here are the ones I have made so far. They increase in difficulty as the go along.
1.
