Looks like an old rug or a computer chip.
Source Patutin Sergey
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
The image depicts the Japanese Edo pattern called "seigaiha" or "青海波" meaning "blue -sea- wave".I hope it's suitable for the summer season.
Source Yamachem
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A seamless pattern formed from background pattern 102
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
Prismatic Hexagonalism Pattern No Background
Source GDJ
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Seamless Background For Websites. It has a texture similar to cork-board.
Source V. Hartikainen
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
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
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin