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.
About.com
Digital Granny
SAG55 Squares
Stargazer's Links to 6 inch squares
Stargazer's Links to 7 inch squares
Stargazer's Links to 8 inch squares
Woolworks(knitting Patterns)
Priscilla's Crochet - patterns for squares 6 inches to 12 inches