We’ve got some prison ebook covers up at selfpubbookcovers and we have many more covers to browse through.
A special author/publisher alert from Smashwords founder, Mark Coker. https://www.smashwords.com/about/updates
We’ve been designing ebook covers for 9 years, and have always been happy to do an unlimited number of proofs for our clients, but we’ve had so many looky loos who disappear somewhere along the design process that we’ve decided to institute a $20 Start Fee for new clients. The time we lose in these fruitless endeavors is better devoted to our valued clients who are serious about having Caligraphics design a book cover for them.