Howdy from Wyoming, Zombie. I'm glad you've found DCM and that you'll be suitably impressed with the offerings here. I believe you will find examples of the covers you are looking for from a variety of publishers. I suspect you will find an item or two which will inspire you. You can just use the preview feature to see covers of most issues. Chances are you know about Fiction House's "Planet Comics" but some of the smaller publishers (Orbit, Ziff-Davis) also flirted with science fiction.
Good Hunting,
Jon
