|These books don't exist yet.|
Also: A picture of a printed book can help to sell ebooks.
If you have a flat cover image, it can magically become a realistic picture of a book at http://www.myecovermaker.com. I've been a happy customer for years.
You can choose from a huge selection of book types, and even CD-ROMs, loose-leaf notebooks, iPads and multimedia packages. You can pay $14.95 per month or $99 per year for unlimited downloads. If you don't want to pay for a membership, you can pay a one-time download fee of $4.95 for a cover.
The tech support folks respond fast and have the right answers. Help is also available from users in the online forum.
The service is extremely easy to use, and an image takes less than a minute to render and download. There are nearly 100 designs available. New devices (Nook Color, Kindle Fire, MacBook Air) are added often, and there are format variations (back of book, stacks of books, books lying down and standing up, iPads and iPhones horizontal and vertical).
You can also "make" non-books like DVDs and DVD packages, and you have various editing options including cropping, re-sizing and choosing background colors. Images are stored online and you can download both 2D and 3D images for different purposes. The site provides many background images, plus links to free illustrations.
I was able to create the image of a video showing my faces. It's not particularly useful, but it might stimulate some thought.
My publishing company could not function without My eCover Maker. Try it.