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
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
I’m not going to use the word Retina for all the new patterns, but it just felt right for this one. Huge wood pattern for ya’ll.
Source Atle Mo
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Background formed from the original with an emboss effect.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Prismatic Basic Pattern 2 No Background
Source GDJ
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
The name is totally random, but hey, it sounds good.
Source Atle Mo
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Sort of like the Photoshop transparent background, but better!
Source Alex Parker