This is a small mod that works by including modified copies of the func_normal.fp and lensdistortion.fp shaders as found in gzdoom.pk3.
And, uh... it gives this trippy effect. It should work with pretty much anything and any map pack, so have fun playing through all your favourite Doom engine games and map packs whilst touching fuzzy, getting dizzy.
Latest GZDoom SVN ONLY. Will not work with ZDoom or Zandronum!
Note: Turning on "Lens distortion effect" in the OpenGL preferences (or typing "gl_lens 1" into the console) is highly recommended for the full effect. As usual with this kind of stuff, beware of possible motion sickness and headaches.
Is this trippy shader not enough alone? Are you brave enough? Try loading it alongside with these following mods, or you can combine them all. If you dare.