A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Derived from a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Seamless Green Tile Background
Source V. Hartikainen
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
A comeback for you: the popular Escheresque, now in black.
Source Patten
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua