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
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
Prismatic Snowflakes Pattern No Background
Source GDJ
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
A version without colours blended together to give a different look.
Source Firkin
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
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
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 pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A pale orange background pattern with glossy groove stripes.
Source V. Hartikainen
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin