Using the cakes below. I am not much cop at DTP. I find that the layout that works best for me is a long thing band of colour along the opposite side of the page to the spine, with text tight wrapped to the contours. The above is not very good but I think that it will have to do.
This can be achieved in Microsoft word by placing image in the background and then drawing a line freehand around the image and setting the shape thus draw to "wrap tight"