Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Prismatic Abstract Geometric Background 2
Source GDJ
A nice and simple white rotated tile pattern.
Source Another One
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857
Source Firkin
Retro Circles Background 7 No Black
Source GDJ