Much of those are related to the engine itself too. Like the blue screen glow when using Quad Damage is called by the engine. You could swap the IT_QUAD and IT_INVISIBILITY - what would happen then is they'd still function the same, but when you get Invisibility - your screen would glow blue. It may be possible without engine editing, but I am doubtful thus far. 
Colored lighting has been done for Quake.
http://www.quaketastic.com/upload/fi...h_May_2009.zip

Colored lighting has been done for Quake.
http://www.quaketastic.com/upload/fi...h_May_2009.zip
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