Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
Abstract Ellipses Background Grayscale
Source GDJ
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Prismatic Groovy Concentric Background 4
Source GDJ
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
Prismatic Hexagonalist Pattern No Background
Source GDJ
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin