A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
An alternative colour scheme to the original seamless pattern.
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer