A downloadable OpenTriangle
OpenTriangle is a software written in pure Java to represent a better wallpaper. Using OpenGL (LWJGL), geometry is rendered on screen with changing colours and brightness. How everything looks out is up to you: Everything is customizable in a config file. Look up https://eric-server.de/opt/docs.html for reference! Let me know if I can improve your user experience!
Simply download the opt.zip file, extract it into any folder and run the jar file. The config.ini file can be found in the "res" folder together with some sample code ready to be pasted!