This is a potential destination that pops up for me from time to time. I call it "the darkness". It is usually inky black for me, the first time it happened it almost obscured my entire vision, a weakly pulsating inky blackness. I threw on the lights to ward it away, and the darkness shattered into white skeletal dinosaur-like ghosties, moving in the most disconcerting way. Until I fell asleep later in the night i could "feel" something watching me, an eery feeling. I don't know what variables might lead to these experiences, although for me it was only after a period of daily DMT use, about one week. Since then I sometimes get close to that place, but I've never fallen so suddenly into it.
I forgot to mention that during the dark experience I outlined, there was an odd feeling of sleepiness or heaviness... I wanted to sink into the ink. It took a strong command to whatever was producing this darkness to get it together enough to turn on the bring light.
It's not all colors and fractal elves... Nothing has shown me such existential terror asDMT (not the experience I list), but through it have seen things rarely glimpsed by man! But I have learned to hold it at arms length, even after the best experience take lots of time before using the stuff again.