This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A repeating background with a look of paper. I have added some changes to PatCreator. Now you can share your designs by submitting them to a new gallery section. Start by clicking Edit with PatCreator above.
Source V. Hartikainen
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
This one is amazing, truly original. Go use it!
Source Viahorizon
The name is totally random, but hey, it sounds good.
Source Atle Mo
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
A seamless pattern formed from a square tile based on a jpg on Pixabay. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen