An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
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
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Alternative colour scheme for the original floral pattern.
Source Firkin
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Geometric triangles seem to be quite hot these days.
Source Pixeden
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen
Prismatic Geometric Pattern Background
Source GDJ