To create a ball or around object, you will need to create it using the 3D Custom Workshop PowerTool => Open the Power Tool => draw the desired curve => Use the Revolve Tool

An additional resource => Go to your Furnishing library => Decoration => Miscellaneous => "Globe Exotic" => insert the object => right click => 3D Custom Workshop => select and delete the parts that you don't need, keeping the globe => Save to your library.