Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Prismatic Hexagonalist Pattern No Background
Source GDJ
Abstract Tiled Background Extended 10
Source GDJ
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
There are many carbon patterns, but this one is tiny.
Source Designova
A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.
Source V. Hartikainen
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
Prismatic Groovy Concentric Background
Source GDJ