The Sci-Fi Anthology Progresses, Slowly.

Image via CrunchBaseSo far untitled, the collection of my science fiction stories I'm currently putting together is well under way. There's a need for some minor editing and formatting before I can transform the text into the style needed by the machinery at Smashwords that converts text into the formats suitable for the many available eReader platforms.
I'm also gathering images to use for a cover design for the project. I don't suppose any of you know of any good sites that allow free commercial use of images, by any chance?