Kaliber10000 has a huge collection of free pixel patterns.
There are currently 900+ free patterns that can be previewed & browsed easily.
Some patterns in the collection are limited to non-commercial use or some may require a link back. They are mentioned very clearly for every pattern.
Advertisements:
SSLmatic - Cheap SSL Certificates (from $19.99/year)
Dreamhost $50 Discount Code: WRD
Follow WebResourcesDepot At Twitter And Get More Resources!