> It's not technically an hallucination I don't think it's hppd, but it's something.

I think you just learend to pay attention to nuance in color and color combinations. I had similiar experience without psychedelics after taking a course on color and color composition by a graphic artist. The course was a combination of traditional color and composition theory with art therapy.

My perception was never the same after, i learned to find joy in stopping for a moment and contemplating the things i see. Even if it is a trashcan with peeling layers of fading paint.