Free Pattern Sites for
Crocheted and Knitted Squares
Here are a few sites with many patterns and links to help you in your search for patterns.
Another good choice is the search engines. They can find you even more patterns.
Stargazer's Links to 6 inch squares
Stargazer's Links to 7 inch squares
Stargazer's Links to 8 inch squares
Priscilla's Crochet - patterns for squares 6 inches to 12 inches