From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Black brick wall pattern. Brick your site up!
Source Alex Parker
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen