Coloring pages you can produce from the internet are a unrealistic (vs. realistic) way to hold your kid's attention.
Try to expect a universe without any color.

Really Big Coloring Books Debuts Bi-Lingual Spanish-English Line of Custom and Imprintable Coloring Books
Multi-purpose bilingual coloring books designed for children ages 2 to 12. Designed for use by the business community to educate - inform parents and children alike on a variety of subjects from Safety issues to Dinosuars to ABC'S and a host of other topics.

Coloring Books Online
The coloring book has been a mainstay of any child's development for almost a hundred years. I imagine that it goes even further though, as young cavemen and women playfully smeared berries and dyes on the wall to express their developing view of the world. Regardless of the history it is easy to understand that coloring is just something fun for children to do. It's simplistic art that gives a sense of accomplishment while tuning their motor skills and creativity. This old classic isn't tied down to a physical form though.

The Fun of Coloring Books For Children
Entertaining small children on rainy days can be a real challenge A great way to keep them happily occupied can be to give them a coloring book