The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
Sharp pixel pattern, just like the good old days.
Source Paridhi
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Neat little photography icon pattern.
Source Hossam Elbialy
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Redrawn based on a drawing in 'По Сѣверо-Западу Россіи' Konstantin Sluchevsky, 1897.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
To celebrate the new feature, we need some sparkling diamonds.
Source Atle Mo
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.
Source V. Hartikainen
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.