From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
This is a remix of "geometrical pattern 01".
Source Yamachem
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A seamless striped fabric-like texture colored in a dark reddish brown color.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
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
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin