What's wrong with the Ganzfeld effect? I can experience it personally even without a uniform visual field by suppressing saccades for about thirty seconds.

Or, at least, I could. It seems I lost the knack of controlling saccades. When I was younger I was able to suppress saccades and induce nystagmus-like eyeballs movement.

Ah, I still can do it after some tries. Amplitude of induced nystagmus seems to have diminished though. And it's more uncomfortable than it was.