I've gotten it from drugs before, mostly LSD. It's definitely different, although having it temporarily wasn't all that disruptive (at least not compared to the rest of what I was experiencing). I felt the colour purple, and when my friends spoke, the sound coming from them was colours. My friend, R, would speak, and the area around his head would "fill" with a dark blue, and it would emanate outward a distance somewhat unevenly, but not too far from his face. For my friend, N, it was green. To feel a colour is really indescribable, however. There's not much more I can say other than I "felt" it (as an emotion or state of being, not physical tactile sensation). What I felt was... purple. Other than the colours with noise and feeling purple, I can't say I've experienced anything else.