A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Might not be super subtle, but quite original in its form.
Source Alex Smith
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The image a seamless pattern of a wire-mesh fence.I want you to use this pattern as a lower layer.
Source Yamachem
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)
Source V. Hartikainen
Black brick wall pattern. Brick your site up!
Source Alex Parker
One more sharp little tile for you. Subtle circles this time.
Source Blunia
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
High detail stone wall with minor cracks and specks.
Source Projecteightyfive