The variety of them that are offered ensures that children of various ages can find something that they would be content with. In fact, you may feel good about composing a list of great sites where various online printable coloring pages can be found. The other option is just to type specifically what you are looking for into a search engine and it will bring up relevant pages to get it.
Today most homes have a printer on hand and that makes it fast and easy to use online printable coloring pages. They don't take much ink either so you can find the value is there all the way around. If you don't have a printer at home you can often use those at the local library to print the coloring pages for a very small fee.
There are so many online printable coloring pages that you can have a blast offering them to your children. Perhaps you don't have children of your own but you often have friends and family that come over with their young ones. You don't want the kids to be bored at your house. Allow them to pick some coloring sheets that you can print for them. Have crayons and other supplies on hand for them and they will feel very welcome in your home.