A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
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
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
A white version of the very popular linen pattern.
Source Ant Ekşiler
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin