Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Geometric triangles seem to be quite hot these days.
Source Pixeden
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
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
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Colorful Floral Background No Black
Source GDJ
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin