As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Prismatic Abstract Background Design
Source GDJ
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
The image is a seamless pattern of a fishnet.
Source Yamachem
There are many carbon patterns, but this one is tiny.
Source Designova
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
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
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
A seamless background pattern with a texture of wood planks. This wood background pattern has vertically arranged planks. You may try to rotate it 90°, to see how it will look like when the wood planks are arranged horizontally.
Source V. Hartikainen
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Might not be super subtle, but quite original in its form.
Source Alex Smith
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren