Changing the background.
You can choose from a large selection of images and designs to further personalise your booklet. Simply click the background button in the top bar and pick from the library of images, or select "no background" to keep the pages blank. You can choose to apply the background to just the outside pages of the booklet or to all internal pages as well.
If text is harder to read with the new background you can toggle an overlay on or off from the top bar which will allow text to be more legible over some of the more colourful backgrounds.