Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
The image depicts polka dot seamless pattern.
Source Yamachem
Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
A seamless background tile of aged paper with shabby look.
Source V. Hartikainen
Might not be super subtle, but quite original in its form.
Source Alex Smith
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin