Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
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
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
A bit strange this one, but nice at the same time.
Source Diogo Silva
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran