With online printable coloring pages you never have to keep volumes of coloring books around. Most children change what they would like to color often. They bounce around from one theme or one set of characters to the next. Therefore they may abandon that coloring book with princesses or cars days after you buy it. Printing out the pages though allows them to always get what they want.
Online printable coloring sheets though can be quickly delivered at the reception desk. That will reduce the anxiety for kids as they wait. It also enables the parents to be able to talk with other adults and not have so many interruptions. Sometimes online printable coloring pages can be offered for educational themes, holidays, or even coloring contests.