These tips are from the revised edition of
Creating Great Web Graphics
, and are written specifically for Photoshop version 4.
Tutorials for creating backgrounds in Photoshop:
Create Seamless Pattern Tiles in Photoshop
Making backgrounds using paint tools in Photoshop.
Cloud Magic in Photoshop
Using the cloud filter to create seamless backgrounds.
Seamless Patterns from Scanned Objects
Creative backgrounds from common objects.
More About the Book