I suppose maybe it was fallout from acid house/rave, but even in very mainstream consumer culture there seems to have been a sort of resurgence (in the early-mid '90s, I mean) of what might very loosely be termed 'psychedelia', but with the dark undercurrents of 'freakout' that were the hallmark of '60s psychedelia somehow excised.
So there were day-glo Bermuda shorts in the late '80s, giving way to Global Hypercolor in the early '90s, coupled with Magic Eye images, early 3D computer graphics and an obsession with fractals as a decorative form (inspired by Gleick's
Chaos and the subsequent public interest in 'chaos mathematics' - cf. Jeff Goldblum's character in
Jurassic Park). A "'nuum', if you will.
Funny to see how elements of this are being revived, in the form of 'nu-rave', by people who are in the main too young to remember these times, if they were even born at all.
Also, there is a huge overlap between things mentioned in this thread and in the 'opposite of goth' thread. Perhaps the early '90s was the last good time to be a real goth, before such heresies as 'cybergoth', nu-metal and emo travestied the scene...