Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Retro Circles Background 5 No Black
Source GDJ
Prismatic Triangular Background Design Mark II 5
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A free seamless background pattern for use on websites.
Source V. Hartikainen
This one is amazing, truly original. Go use it!
Source Viahorizon
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
A seamlessly tile-able grunge background image.
Source V. Hartikainen
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein