Update: It seems that the UNFCCC background page referred to below has changed and the link no longer works — see table of contents. (realclimate.org)
Using Book Creator, the students created their own title page for their «I Wonder» book, and set a few background pages. (bookcreator.com)
If you have the original Kindle Fire you can change the background image on the start screen to show your own images (see the bottom of my Kindle Fire backgrounds page). (lovemyfire.com)