Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
Plywood Web Background background image for use in web design.
Source V. Hartikainen
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Gold Triangular Seamless Pattern No Background
Source GDJ
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Colorful Floral Background No Black
Source GDJ
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Prismatic Hexagonalism Pattern No Background
Source GDJ
A version without colours blended together to give a different look.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes