Web Design – Web background tutorials
Here's an excellent list of resources from noupe
Archived entries for backgrounds
Web Design – Background Generators
Here is a list of 15 different background pattern generators.
I threw one together quickly:
I made it with http://bgpatterns.com/
Colour levels are way off, and it isn't optimised for use, but it's a good example of what can be done in 5 minutes 
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