A bit of scratched up grayness. Always good.
Source Dmitry
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
8 by 8 pixels, and just what the title says.
Source pixilated
Sometimes you just need the simplest thing.
Source Fabricio
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
You guessed it – looks a bit like cloth.
Source Peax Webdesign
A free seamless background with pink spots.
Source V. Hartikainen
From a drawing in 'La Principauté de Liège et les Pays-Bas au XVIe siècle', Société des Bibliophiles Liégeois ,1887.
Source Firkin
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion