Here are some background examples.

If you are looking for some really good backgrounds, check out this site: Subtle Patterns. You can both make the background pretty and small size so that the page loads faster.

Hear some other sources that are recommended for tiled backgrounds.
Please respect the particular copyright regulations:

Background FAQ:

Why am I still seeing a background picture when I have selected the "None" option in the "Background Image" field?

Answer: you most likely have a picture labled background.jpg included in your list of "Images ready to use on your site". Delete this image and then the "-None-" option will work.