When I used to take methylone in a single oral dose of between 180 and 250 mg (before, in other words, mephedrone taught me about abusing stimulants), I found that - if I turned off the light or closed my eyes - after the peak entactogenic phase but during the subsequent stimulation (which I hadn't yet got a taste for), I had often rather intense geometric visuals, such as intricate grids spiralling towards me. They had colour, form, and movement, but their colour wasn't particularly noteworthy. They were mostly just about the moving geometry. Also saw what I thought (genuinely believed on some, near-psychotic, occasions) were dark shadowy rats flying towards me through the air (again, only with the lights off). The geometric CEVs were, iirc, enhanced by cannabis.
ETA: With eyes open, yeah some subtle changes, a brightening and some sort of distortion, but nothing massive. Most low level and generic psychedelic OEVs ever, if anything.
Oh, and I do get a weird sort of OEV with higher doses of methylone and mephedrone. Strangely, it's confined to images on a computer screen, and specifically to videos. Basically, there's a kind of colour shift, such that previously near-grey areas become, say, a rich dirty orange colour, or a previously brownish area becomes a bright green. This happens consistently each time, once I pass a certain fairly high recent dosage, over the course of a night-long binge; and appears not to affect anything else other than video files.
I wonder whether it's an effect that's mediated by pupil dilation and the way that colours are produced on a computer screen to be right for normal luminance and pupil size but not for unusually large pupil size? Generally at that stage I am not of sufficiently clear mind or intent to check what my pupils look like, I'm afraid, so I'm yet to test that hypothesis.
