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
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Prismatic Geometric Pattern Background No Black
Source GDJ
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Abstract Ellipses Background Grayscale
Source GDJ
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
Subtle scratches on a light gray background.
Source Andrey Ovcharov
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Fix side and a seamless pattern formed from circles.
Source SliverKnight
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Prismatic Hexagonalist Pattern No Background
Source GDJ