A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Sometimes you just need the simplest thing.
Source Fabricio
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić