One of my design clients also had written a collection of books and needed help publishing them online. I edited, formatted, and published the books online through Amazon's CreateSpace digital publishing tool.
The author, Dr. Warren Stagg, had chosen the cover images to be used, but had little ability in making the rest of the cover "happen". This project is more typographic than anything else, as making the titles and subtitles "work" with the pre-selected images was the challenge.
Subtle outer glow on text, translucent boxes, and classic, clear fonts make it easy to read.
The books are quite a read, self help from a metaphysical perspective. Check out the books HERE.