While most authors don't have the knowledge or desire to create a book cover design on their own, it's important that they invest in the process.
The design process should start with the writer's vision of a scene that gives an impression of the work he has completed. You can also get the best idea for book cover layout via http://firewirecreative.com/.
At the very least, they should be willing to convey their ideas to someone who can put them on paper.
One of the most effective ways for writers to start designing a book cover is to take inspiration from existing book covers that inspired them specifically. This does not mean that the cover is plagiarized. Instead, it simply provides a visual guide to the types of items they find interesting on the cover of the book. It's important to remember that writers are readers too. If a particular book cover related to the genre of his work appeals to you, that cover will also appeal to potential buyers.
Many graphic designers find this a useful process when it comes to applying the author's own design ideas to a book cover. This type of visual stimulus can be useful for the designer to provide direction about the feelings the author wants to convey on the book cover.
Once this step is complete, the graphic designer can move on to the most important part of the design process – summarizing the essence of the book in a separate cover.