I actually did find those old rotating star screen savers (a small star and a bigger star version). But Windows XP does not allow using those old files as such. If there is an expert on the forum, perhaps he/she could help a bit.
I did try a free screen saver tool to build an installation file. It works fine but the free version adds some advertisement text of its own, one might prefer to get rid of that but I'm not keen enough to pay for a version producing a clean screen saver.
I thought I saw a reference to the copyright owner but lost it. I would assume copyright would not be too much of an issue if it was made free for older Windows versions.