What do blind people dream of if they never saw anything in their life and do they see color or just black?

It looks like blind people have dreams that involve their other senses. They also see many things that we ourselves have never seen before. Like when we dream of a new invention or a person we've never met or a place we've never seen or been to. We rarely have these dreams because we have the ability to see but if we didn't, like people who are blind, we would be using the imaginative part of our brain a lot more and see things that we have never seen.[ somewhat like the third eye]
Well, if the person was blind for their whole life, they would dream with their other senses. But, if they were blind at a certain point in their life, they would dream of things they saw before they were blind.