Tommander Spořič!

Tommander Screensaver is an ordinary application similar to classic screensavers, but it is not closed by pressing a key (except ESC and ALT+F4) or by moving the mouse. It loads images from an external package, which is actually a simple ZIP archive with JPEG images "inside".
Changing the package is done by simply changing the file name in the Settings window. Everything else is done by the program.
Other packages are available on the program's website.