Lovely pattern with splattered vintage speckles.
Source David Pomfret
This background image is great for using in web design or graphic design projects. And don't forget to visit the homepage. I frequently update this resource with fresh tileable backgrounds.
Source V. Hartikainen
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
ZeroCC tileable beechwood wood texture, generated in Neo Texture Edit by me. CC0
Source Sojan Janso
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
You may use it as is, or modify it as you like.
Source V. Hartikainen