Take television static, color it red, blue, and green, dull it, mute it, make it faint, and apply it to your entire field of vision. This is what I see, almost constantly.
The static isn't concentrated; it's spread out. It can be very faint, but I don't think it ever goes away. It doesn't change in size. It's easier to see inside than it is outside, and is easier to see in the dark than it is in the light. It's like a visual tinnitus. It's similar to, but not necessarily the same thing as, floaters, those colored bright blotches seen after you look at a bare light bulb or something. Sometimes the static will "sink" into patterns on floors and walls, but this is very uncommon. I've never suffered eye trauma. I don't use my laptop or television in dark rooms. I have 20/20 vision. I get plenty of sleep, I exercise, I eat well when I can. What's going on? Wikipedia has an article on something called "visual snow". It describes what I see, but offers no satisfactory conclusions, since I don't get migraines and have never used hallucinogens.
This may be unrelated, but some other visual "things" I've experienced are image trailing and objects swelling and shrinking and shifting.
So...any thoughts? Ideas? Explanations? Similar experiences? Etc?