My favorite screensaver of all times is Electropaint. It has its origin in the IRIX OS. The word mesmerizing was always one of the things I connected with this screensaver. Electropaint™ is a US Trademark of Tristam Visual.
When I started to keep this little gem available a few years ago, there were several sources of information. As time moved forward some websites related to Electropaint closed down.
The site of Tristam Visual is still there.
Then there was Lloyd's Lounge. I think it was the original source of the PPC version of Electropaint OSX. The URL http://www.lloydslounge.org/electropaint/ leads to some other content.
Alexander von Below made a port of the PPC code base to Intel. His Electropaint webpage can still be found in the archive.org database.
My modest contribution is just the adaptation to 64-bit Intel. This was necessary because starting from OS X 10.6 every screensaver module has to be 64-bit code. Apple has a tech note about this. Basically it was just about changing some build settings in Xcode.
Someone named Peter was so kind to send me some preview images. I've added them to the project.
Lately Douglas Carmichael informed me about a bug when trying to build under OS X 10.10. I updated the project to correct the issue. There is still a problem that Electropaint does not stop when you connect with a remote desktop tool called Splashtop. Any help on this issue is appreciated.
Download link for ElectropaintOSX 0.3.4 (binary and source code included).