Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Subtle scratches on a light gray background.
Source Andrey Ovcharov
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Psychedelic Geometric Background No Black
Source GDJ
From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
A free seamless background with pink spots.
Source V. Hartikainen
From a drawing in 'Hundert Jahre in Wort und Bild', S. Stefan, 1899.
Source Firkin
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin