Unless you've already internalized how this stuff works, ShaderToy code is pretty incomprehensible. Some of it is commented, most of it isn't, and even then, GLSL is not a great literate coding language.

Here's an example of a blog post I wrote "repackaging" a technique:

http://roy.red/droste-.html#droste

Compare to the code I'd found on ShaderToy:

https://www.shadertoy.com/view/4tlGRn

Is it interesting if you've already spent time on this particular thing? Probably not. But it's meant to be a useful introduction, not a novel work.