The original enhanced with one of Inkscapes's filters.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Abstract Tiled Background Extended 12
Source GDJ
This light background pattern has a texture of "frozen" surface with diagonal stripes. Here's an yet another addition to the collection of free website backgrounds.
Source V. Hartikainen
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Abstract Geometric Background 3
Source GDJ
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Fix and cc0 to get the tile this is based on.
Source SliverKnight
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
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
Might not be super subtle, but quite original in its form.
Source Alex Smith
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry