A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
A repeating background with wood/straw like texture.
Source V. Hartikainen
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Prismatic Groovy Concentric Background No Black
Source GDJ
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Prismatic Geometric Pattern Background
Source GDJ
A comeback for you: the popular Escheresque, now in black.
Source Patten
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Colour version of the original pattern.
Source Firkin