From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Prismatic Groovy Concentric Background 3
Source GDJ
From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
The image depicts polka dot seamless pattern.
Source Yamachem
From a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Embossed lines and squares with subtle highlights.
Source Alex Parker
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
The name is totally random, but hey, it sounds good.
Source Atle Mo
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Prismatic Floral Background No Black
Source GDJ
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen