Not sure about others but I can see what my brain thinks is a picture of Mount Everest. It's not a photorealistic image because I've never actually seen it IRL, but it's just a composite idea of Everest from movies, YouTube videos, images, etc. Now it's not quite the same as seeing something like you would through your eyes - you still see darkness when you close your eyes - but it's a vision that you can see in your "mind's eye" which is in color, vivid, you can hear it, smell it, feel it.