Number five from the same submitter, makes my job easy.
Source Dima Shiper
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Psychedelic Geometric Background No Black
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Alternative colour scheme for the original floral pattern.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
Same classic 45-degree pattern, dark version.
Source Luke McDonald
This is the remix of "blue wave-seigaiha".This is the flowers of pink silk tree which is called "nemuno-ki".About pink silk tree ,refer to here:https://jp.pinterest.com/pin/500744052301210439/
Source Yamachem
A background tile of dark textile. Made this a long time ago and just now decided to publish it.
Source V. Hartikainen
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker