You can find many clip arts with slightest modifications yet with different subject matters either, thus there is a continuing process of preparing, producing and using of these school clip arts by a lot of people. With everything else changing so fast, I believe it is valuable to retain some things essentially as they have "always" been. If your little one is fascinated by Disney characters such as Donald Duck, Mickey Mouse or Tinker Bell, you can selectively choose to print coloring-pages on this particular theme. Cartoon characters tend to constantly fall in and out of fashion. If the current trend is that of Ben 10 or the Incredible, you can easily generate hundreds of printable coloring sheet based only on these cartoon characters. The minuscule effort it takes to compile an on demand coloring book is worth the smile on your child's lips.
You can find hundreds of such useful coloring pages with biblical themes, alphabetical games and more variations for preschool kids. However mind that you would need good configuration of system and good printer quality with perfect cartridge for fine print quality. Also make sure that you command the fine print or best print for your printer while printing the biblical pages for best results and perfect line drawing.
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.