Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
It’s big, it’s gradient—and it’s square.
Source Brankic1979
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
Prismatic Polyskelion Pattern No Background
Source GDJ
A bit of scratched up grayness. Always good.
Source Dmitry
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Abstract Tiled Background Extended 8
Source GDJ
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
ZeroCC tileable beechwood wood texture, generated in Neo Texture Edit by me. CC0
Source Sojan Janso
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin