Though not the best option for a damp wall, a wallpaper will definitely help hide cracks. It also works wonders in covering up pen marks, dirt, grime and other stains.
Hang a frame exactly where there is a crack on the wall. A frame of your child’s favourite superhero will definitely earn you some brownie points.
Place a shelf or a cabinet where there is a wall crack. Using a bookshelf will also help create a cosy space for your kid(s).
Pull out a box of paints, grab a few paint brushes and paint the walls with an imaginative landscape or an abstract design. Let the walls be your canvas.