How easy is this. You could place a calendar behind the window and use the window as a dry erase board. The blue ball jar project is an excellent organizational tool and the blue ball jars add a fun color to the room. All that is necessary for this project is a piece of floor molding and the medal rings to affix the jars. Once, you attach the molding to the wall and you are ready to fill the jars with pens, pencils, markers, paint brushes and much more.