Hang pictures of their friends on the wall for a 'wall of fame' in your childrens bedroom. Or fill frames with butterfly stickers. Another idea, paint the favorite cartoon on a painting and hang them on the wall or we can do it for you (see www.artarchive.nl for more information). My mother painted this pink Jip & Jannek for above the childrens beds. The big empty walls will be cosy in no time.