Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
White handmade paper pattern with small bumps.
Source Marquis
Sharp but soft triangles in light shades of gray.
Source Pixeden
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
A heavy hitter at 400x400px, but lovely still.
Source Breezi
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
A seamless tessellation pattern. To get the tile this is formed from, select the pattern in Inkscape and use shift+alt+i.
Source Firkin