I have just stumbled upon a really cool website. This site allows kids to create and illustrate their own book covers. It is a very easy program to use. The only drawback is that you cannot save it to your computer. You must print it right away. Check out this site now: http://www.readwritethink.org/files/resources/interactives/bookcover/
The website provides the following as their overview:
The Book Cover Creator is designed to allow users to type and illustrate front book covers, front and back covers, and full dust jackets. Students can use the tool to create new covers for books that they read as well as to create covers for books they write individually or as a class. Students can use text tools to add formatting to their titles and book notes, add shading to background areas of the cover, and draw original images to illustrate their covers and dust jackets. The tool is easy to use, made even easier with the Book Cover Planning Sheets, printable PDFs that students can use to draft and revise their work before creating and printing their final book covers or dust jackets.