I've never done anything like this before so I'm not sure how it will all turn out, but there's a free version of the online cover creator tool HERE. (creativindie.com)
He also offers a free, online cover creator tool, along with video tutorials to help you make the most of it. (thewritelife.com)
UPDATE: After months of work, we've just launched the coolest online 3D book cover creator in the world. (creativindie.com)