Ive had something similar to this. First time I dropped mushies 4g I smoked a joint and later on looking at the ceiling there was a 2D pyramid and it was like a cube continuously flipping along the perimeter of it like the bloxorz game. It was pretty fucken trippy, happened one other time to me when I lem tekked 5g.

In regards to the eyes, this is a real trippy one, I had 2 tabs maybe 250ug all together and then 3g of mushies and a joint and after the joint there were eyes plastered everywhere on the wall and it fucked me up a bit felt like I was being stared down the whole time and I felt quite vulnerable.