This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0
Source Sojan Janso
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
This is sort of fresh, but still feels a bit old school.
Source Martuchox
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
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 huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Black paper texture, based on two different images.
Source Atle Mo
Based from Design Kindle
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin
The image is a seamless pattern of a fishnet.
Source Yamachem
Prismatic Hexagonalist Pattern No Background
Source GDJ
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Prismatic Polyskelion Pattern No Background
Source GDJ