Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
One more sharp little tile for you. Subtle circles this time.
Source Blunia
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Background formed from the original with an emboss effect.
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
A repeating background of beige (or is it more vanilla yellow) textured stripes. One more background with stripes.
Source V. Hartikainen
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin