For back ground I rely on free pictures from sites like Wiki commons and Pexels. I use Word to create text overlaid over the picture. When I have what I'm looking for, I save it as a PDF, import it to Gimp2. Once there, I crop it and scale it to the dimensions required for eBook covers. While I can draw, I'd need a bit for talent to do a credible job of creating something using my pure art skills. I surely couldn't do it in a timely manor required to make my customers happy.