Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Prismatic Polyskelion Pattern No Background
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Prismatic Groovy Concentric Background 2
Source GDJ
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A free background pattern with abstract green tiles.
Source V. Hartikainen
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Prismatic Geometric Pattern Background
Source GDJ
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin