1K Intro Shaders

I have been looking at how 1k demos are done using shaders and after making a couple of very simple looking screens I have now made something that looks abit more interesting and I am wondering if I can make it look like an RGB plasma effect. I haven't done any shader coding before so my efforts are rather random in there results as I try out things and hunt around on the web for information on them.

Here's a little screen of what my shader currently looks like, it does change but only because I am spinning the quad I render, but my next attempt will hopefully not need to do that.