I am working on a modpack dedicated to Commander Keen. http://shikadi.net/keenwiki/ I currently only have one mod though (Standard Galactic Alphabet). This is the alphabet that is frequently found written on the walls in most Commander Keen games.
Letters are wall mounted and glow in the dark with an intensity of 14. Here is a chart so you don't get confused as to which letter is which.
The actual mod is attached as "sga.zip".