Were De La Soul popular within the rave scene? The "hippy" thing (even though they distanced themselves from that quite quickly as far as I can tell) plus the wall of sound samples that were a feature of rave music (though crossbred with Belgian hardcore, acid house, etc.).
I suppose it was them and Public Enemy who were using samples in this way at the time - colliding them collaging them together.
Wu Tang / RZA too in that lineage, cutting up and colliding samples
The modern rap that uses samples (alchemist, madlib, et al) doesn't do that collage thing so much, from what I've heard.