Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
Prismatic Geometric Pattern Background 2
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
This is a remix of "geometrical pattern 01".
Source Yamachem
Retro Circles Background 4 No Black
Source GDJ
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
A seamless canvas texture for using as background on websites. Colored in pale tones of brown.
Source V. Hartikainen
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
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
Inspired by the B&O Play, I had to make this pattern.
Source Atle Mo
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin