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
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Prismatic Hexagonalist Pattern No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Wasn't satisfied with the original's colouring. Too much component transfer and colormatrixes yet the results are lacking a bit. So this time it is a simple black to transparent fade, making it possible remixing easily once there will be other blending modes supported as well. Probably in inkscape 0.92.
Source Lazur URH
You guessed it – looks a bit like cloth.
Source Peax Webdesign
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
This one needs to be used in small areas; you can see it repeat.
Source Luca
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
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