Background image

I know this may be the simplest question ever but I am having a hard time getting my background image on my site to look good and not choppy. I cut out a square, I set it as my background image in dreamweaver and it always just seems to look terrible. Anyone have any tips on creating a seamless background image?

Here are a couple of good tutorials (very different since you didn’t say what sort of pattern):
http://veerle.duoh.com/blog/comments/creating_geometric_patterns_in_illustrator/

Hope those help some. Using Photoshop’s offset filter and using the clone/healing brushes on the seams also works nicely.