A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
A pale olive green background with a seamless texture.
Source V. Hartikainen
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
Sometimes you just need the simplest thing.
Source Fabricio
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ