A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Black brick wall pattern. Brick your site up!
Source Alex Parker
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Black And White Floral Pattern Background from PDP.
Source GDJ
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom