Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Classic 45-degree pattern, light version.
Source Luke McDonald
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Tile-able Dark Brown Wood Background. Feel free to use it as a background image in your designs or somewhere on the web. By the way, the color seems to be close to Coffee Brown.
Source V. Hartikainen
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Prismatic Abstract Line Art Pattern Background
Source GDJ
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
8 by 8 pixels, and just what the title says.
Source pixilated
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Fix side and a seamless pattern formed from circles.
Source SliverKnight