This is a very cool site my hubbie found: DREAMS OF SPACE.
The site talks about the post WWII era when all eyes were on space travel. A flurry of literature for children was inspired by the possibilities of space travel and moon colonization. This website links to illustrations and book covers on the subject. It's interesting from several viewpoints. The art itself is often created using color plates with a very limited palette. The palette itself is interesting, lots of oranges, aquas, and blacks. And of course the subject matter which is sometimes somewhat comical. If you have some time to kill, have fun looking through everything.
My favorite, though, is the quote by my hero Carl Sagan: "The visions we offer our children shape the future. It matters what those visions are. Often they become self-fulfilling prophecies. Dreams are maps."
I hear ya Carl!