You can propose a colaboration with @lmac ! That could be great! I love the topic and im used to do a lot about SciFi but working with open source image repositories. I can use them on this contest (pixabay for example) or is designed from scratch?
Thanks! Great initiative!
If you want to do a collage or something with the copyright free images... you can do that. Just make sure to cite and source any and all materials or content that isn't yours.