Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Prismatic Triangular Background Design Mark II 5
Source GDJ
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
A free background pattern with abstract green tiles.
Source V. Hartikainen
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Prismatic Groovy Concentric Background 4 No Black
Source GDJ