Releasing this experiment as an OSX screen saver. Download, unzip and then double click to install.
By no means will this save your screen; it is rather GPU intense depending on number of monitors and resolution. I created a screen saver as a passive method to view digital artwork.

You may have to change your preferences to install the screen saver. System Preferences > Securty & Privacy > Allow Applications Downloaded from > Anywhere OSX >= 10.10

Select Screen Saver Options… located in the Screen Saver pane of System Preferences to change the options. Select 1 of 5 color modes or random to choose a different one each time the screen saver starts. There is also the ability to type in a message, limited to 140 chars total and 10 letters per word. Or the message can be disabled.

Releasing this experiment as an OSX screen saver. Download, unzip and then double click to install.

You may have to change your preferences to install the screen saver. System Preferences > Securty & Privacy > Allow Applications Downloaded from > Anywhere OSX >= 10.10 ( trying to get working on intel GPUs, I think I got it working. Ping me if not. )

Select Screen Saver Options… in the Screen Saver pane of System Preferences to change the options.
Day / Night: Switches between the two color modes based on the time of day.
Day: Color mode
Night: Color mode
Manual: Use the color pickers to select your own color choices.