White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Prismatic Geometric Pattern Background 2
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
A seamless pattern formed from background pattern 102
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
White little knobs, coming in at 10x10px. Sweet!
Source Amos
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin