Embossed lines and squares with subtle highlights.
Source Alex Parker
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
A free background pattern with abstract green tiles.
Source V. Hartikainen
Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
Sharp pixel pattern, just like the good old days.
Source Paridhi
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
Light and tiny, just the way you like it.
Source Rohit Arun Rao
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko