Disguise (Fo) makes one thing look like another on mouseover (like a stone minedoor looks like a rock tile)
Conceal (Mag) makes something owned, invisible to others (like a trap which is set is invisible)
Reveal (Vyn) creates a persistent highlight-outline around anything enchanted with Disguise/Conceal/Fabricate.
Reveal (Path of Knowledge) temporarily negates the visual effects of Disguise/Conceal/Fabricate.
Fabricate (Lib) makes something that isn't there, appear as if it is.
Delude (Path of Insanity) makes something nobody else can see, visible to everyone.
Non-exhaustive list of potential applications with both cosmetic and combat applications in mind:
May solve/anticipate many diverse requests with one 'patch'.