CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
A bit strange this one, but nice at the same time.
Source Diogo Silva
A version without colours blended together to give a different look.
Source Firkin
The following free background pattern has glossy diagonal stripes as a texture to it, and it's colored in a light blue gray color. This background pattern is suitable for using in web design or any other graphic design projects. This applies to all background patterns here.
Source V. Hartikainen
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Prismatic Abstract Geometric Background 4
Source GDJ
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
This one is amazing, truly original. Go use it!
Source Viahorizon
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin