Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
Remixed from a drawing in 'Prehistoric Man: researches into the origin of civilisation in the old and the new world', Daniel Wilson, 1876.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Colourful background achieved with gradient fills.
Source Firkin
Prismatic Abstract Geometric Background 2
Source GDJ
Seamless Prismatic Geometric Pattern With Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba