Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Embossed lines and squares with subtle highlights.
Source Alex Parker
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
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
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
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
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes
A seamless pattern with green and yellow diagonal lines on top of a white dotted background.
Source V. Hartikainen
Alternative colour scheme for the original floral pattern.
Source Firkin
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
White circles connecting on a light gray background.
Source Mark Collins
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall