This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Prismatic Groovy Concentric Background 4
Source GDJ
This one needs to be used in small areas; you can see it repeat.
Source Luca
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
I’m not going to use the word Retina for all the new patterns, but it just felt right for this one. Huge wood pattern for ya’ll.
Source Atle Mo
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Prismatic Geometric Pattern Background 2
Source GDJ
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
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
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin