I really like the TerraTime app. It has a number of functions, but I really like their background. It shows a flat map of the world and updates to show what parts are night and day. You have the option of viewing real time cloud cover as well.
I just got it.
How do i use get the background like that?
When it's running go to Menu, then Settings and finally Map Settings. It's the first option. Also when you first set up and press Map, there's an button to set as wallpaper.
I have both GDE and Home++, each with 4 screens. This seems to look better on Home++. On GDE the home page shows the Pacific Ocean with just a part of North America. On Home++, North America is completely on the home page.