High detail stone wall with minor cracks and specks.
Source Projecteightyfive
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Abstract Background Design
Source GDJ
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
You guessed it – looks a bit like cloth.
Source Peax Webdesign
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
Prismatic Abstract Background Design
Source GDJ
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Might not be super subtle, but quite original in its form.
Source Alex Smith