A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers