Assign the custom app library item to a blueprint or add an assignment rule.While in the custom app library item, name the library item at the top of the screen and if you'd like, add an icon at the top left of the custom app library item.Navigate to Library > Add New > Custom App > Add & Configure.You will first need to obtain your desktop image(s) and compress the file(s).This method will lock the desktop picture so that the end user cannot change it Deploy your Desktop Image: