How can i draw an effect on my screen using lua.

Hey, i am wondering how i actually go about drawing the RED Uber effect on my screen using the RenderScreenspaceEffects hook, i dont really know how to go about it, if its not possible i could also do a pulsing effect, i just need a bit of help and guidance on how.

i have looked at http://wiki.garrysmod.com/page/Global/DrawMaterialOverlay hower i cannot find any paths for the effects such as teleport, red uber etc.

Open Valve Hammer Editor > Open texture browser > type: “overlay”