If you want to see what the Masters can do with shaders, let me introduce you to Inigo Quilez and his shader art: https://www.youtube.com/watch?v=BFld4EBO2RE
EDIT: I did not notice you are the author of this article. It's very well done, and I've been looking for more approachable and interactive tutorials on the arts of shader coding.
IQ's personal page on Shadertoy: https://www.shadertoy.com/user/iq/sort=newest&from=576&num=8
Shadertoy is created by Beautypi (Inigo Quilez and Pol Jeremias).
And all of IQ's introductory articles on using Shadertoy.
// Input - Keyboard : https://www.shadertoy.com/view/lsXGzf
// Input - Microphone : https://www.shadertoy.com/view/llSGDh
// Input - Mouse : https://www.shadertoy.com/view/Mss3zH
// Input - Sound : https://www.shadertoy.com/view/Xds3Rr
// Input - SoundCloud : https://www.shadertoy.com/view/MsdGzn
// Input - Time : https://www.shadertoy.com/view/lsXGz8
// Input - TimeDelta : https://www.shadertoy.com/view/lsKGWV
// Inout - 3D Texture : https://www.shadertoy.com/view/4llcR4