I personally love the images in the dashboard, it's lovely to see something new everytime I'm editing a concrete5 website, however I know that some of you may find this distracting and don't need to see the scenic landscapes anymore.
Here a few ways to get this done-
- Copy and paste- http://www.mysite.com/index.php/dashboard/system/basics/interface/ (replace 'mysite' with your own.)
- Search for 'Interface preferences' in the 'intelligent Search' (quickest option)
- Go to Dashboard >> System & Settings >> Basics >> Interface Preferences
These options will all take you to the same page, use the one you prefer.