Not sure if this should go under cover artists or elsewhere, but my eldest daughter works as a 3D modeler, animator, rigger and so on. She's working four jobs right now AND studying full time at uni ... but even so, I told her there could be a demand around here for turning book covers into 3D images.
She's interested, as a sideline, so I thought I'd throw it out there. I don't have an example book because she hasn't done one yet. (The ones in my sig are my own 3D efforts using Blender.)
But, if there's any interest I'll pass it on. I believe there's a site where you can DIY, but some people don't have the time or patience for that.