Here are a few vector dotted patterns and a half tone pattern for you to use for your personal work. If you want to use commercially I just ask that you make a small donation to paypal and show me what you made!
This image was donated by Pearson Scott Foresman, an educational publisher, to Wikimedia Commons, and is thereby in the Public Domain.
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See http://commons.wikimedia.org/wiki/Category:Pearson_Scott_Foresman_publisher