A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
A free seamless background with pink spots.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Prismatic Polyskelion Pattern No Background
Source GDJ
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
Alternative colour scheme for the original floral pattern.
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin