How to design them, create them, and use them. And where to find them. Even better, create your own with a graphics program . Any larger and there is probably too much detail in your image for the text to be readable. Usually you want the image to tile seamlessly - i.e. the join between tiles should not be discernable.
Some graphics programs can make seamless tiles.
To create a left-border effect, create a graphic about sixteen hundred pixels wide and only a few pixels tall. The attribute's value is the URL of the graphic that will be tiled as the background of the page. The user will not see this background in non-compliant browsers , if image loading is turned off, or if the user has overridden the background images in their preferences. The background image will be tiled in the browser's document viewing area. There are many pages on the web that are unreadable because the text or links are swallowed up by the background color.