I have been wondering why 色々 meant "various". I reckon that the archaic "various colours" meaning (as listed on Jisho) generalized to "various", but I wonder why (or how, or when) 色々 specifically, from all other repeated kanji pairs which could have meant "various (something)", evolved that way.
I'm not as much searching for an answer as looking for reference on this, which I could not find in English (and my level in Japanese is far from enough to do a proper search), as well as Japanese etymology in general.