A seamless web texture of "green stone".
Source V. Hartikainen
A seamless paper background colored in pale yellow.
Source V. Hartikainen
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
This one is amazing, truly original. Go use it!
Source Viahorizon
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
An alternative colour scheme to the original seamless pattern.
Source Firkin
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen