For me, recordings of the 90s changed my thinking about looping more from the studio production standpoint than from the standpoint of improvised live performance. At this time I am hard-pressed to name specific albums, though I'll try anyway:
Squarepusher - Feed Me Weird Things
Massive Attack - Mezzanine
Goldbug - Ben Neill
Chemical Brothers (forgot the album title)
Entroducing - DJ Shadow
Meiso - DJ Krush
Those are the titles that jump off the top of my head. Plus recordings and live performances I've heard from LaFosse, Torn, and other LD listers.