Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
This is a hot one. Small, sharp and unique.
Source GraphicsWall
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis