Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Prismatic Geometric Pattern Background No Black
Source GDJ
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
A black tile-able background with paper-like texture.
Source V. Hartikainen
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
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