Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
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
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
This one is amazing, truly original. Go use it!
Source Viahorizon
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.
Source Atle Mo
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The original enhanced with some gradients.
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Seamless Green Tile Background
Source V. Hartikainen
Prismatic Snowflakes Pattern No Background
Source GDJ