You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
One more sharp little tile for you. Subtle circles this time.
Source Blunia
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A seamless web texture of "green stone".
Source V. Hartikainen
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Abstract Tiled Background Extended 8
Source GDJ
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
A comeback for you: the popular Escheresque, now in black.
Source Patten
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
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
This background pattern has futuristic look. So, maybe it could be used on websites or blogs dedicated to video games?!
Source V. Hartikainen
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin