Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Tiny circle waves, almost like the ocean.
Source Sagive
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Prismatic Hexagonalist Pattern No Background
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A seamless pattern formed from background pattern 102
Source Firkin
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A bit strange this one, but nice at the same time.
Source Diogo Silva
Oh yes, it happened! A pattern in full color.
Source Atle Mo
Abstract Tiled Background Extended 8
Source GDJ
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin