This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A bit of scratched up grayness. Always good.
Source Dmitry
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
The image is a seamless pattern of a fishnet.
Source Yamachem
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Might not be super subtle, but quite original in its form.
Source Alex Smith
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso