If wallpaper coloring can be used only within a child's room, the «coloring pages for kids» can be easily printed out and your kid can take it anywhere: outside and when visiting someone. They will be useful everywhere, the baby will not be bored, and could spend time with an advantage. If you have internet access, then the child can offer coloring online. This type of coloring will get your child interested, because they also include some tips.
"The golden age" of coloring books is believed to be 1960-s, because almost all characters were depicted in them, as well as some products (like Planter Peanuts or Campbell Soup)