Check out Kinetic Faith for some free graphics and video for worship. From their website:
KineticFaith.com is a clearinghouse for the graphic and video design work used at our church.We are making all this content available for download at no charge. Our prayer is that this can be a resource for those churches that lack the money or personnel to purchase or develop content for their church and worship services.
Included in this site are worship backgrounds and covers in themed series for specific messages and generic content for any worship setting.