Fullscreen Construction Kit was developed by FMC Connexion to display high-resolution pictures using overscan. It works by piecing together four Degas "blocks" that will then generate the larger image - which can be viewed on your ST using the program provided. The process is simple but I had difficulties with the colour palettes, hence the reason why Milla is in greyscale and the dog is red rather than brown! Also, it's worth noting that I found it easier to create the blocks using my Mac, but there are online tools available to split the original image.
Six images are already on the floppy plus you also have the ability to create your own. This set of image blocks [by Killer D] should give you a better understanding of what's expected from budding Degas artists? But even folk without any pixel artistic skills (me!!) should be fine having a play. So why not give this great program a playtest to see what overscan goodies you can create? Enjoy dabbling and let me know what you make of this!