Prismatic Groovy Concentric Background 4 No Black
Source GDJ
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
The square tile this is based on 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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Retro Circles Background 4 No Black
Source GDJ
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
A bit strange this one, but nice at the same time.
Source Diogo Silva
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Spice up your next school project with this icon background.
Source Swetha
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin