To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Prismatic Curved Diamond Pattern No Background
Source GDJ
A seamless pattern created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Abstract Tiled Background Extended 11
Source GDJ
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Sort of like the Photoshop transparent background, but better!
Source Alex Parker