Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
Prismatic Geometric Pattern Background No Black
Source GDJ
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Almost like little fish shells, or dragon skin.
Source Graphiste
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin