A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Background formed from the original with an emboss effect.
Source Firkin
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin