For the following two , I would cut out the nasa sign and put it on to the background .

It'd put this one in a Polaroid like boarder similar your current covers .

For the next 2 I would probably fade them into each other in a way to create the illusion that the eyes are in the sky .

Title would be in the middle , with a circle ( maybe ) border around it .

Change the back wall to white , & brighten it up slightly most probably making it have the Polaroid look as well .

-hxsitant