Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
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
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
A bit of scratched up grayness. Always good.
Source Dmitry
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Continuing the geometric trend, here is one more.
Source Mike Warner
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter