Sometimes you just need the simplest thing.
Source Fabricio
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
ZeroCC tileable beechwood wood texture, generated in Neo Texture Edit by me. CC0
Source Sojan Janso
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
Gold Triangular Seamless Pattern No Background
Source GDJ
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Prismatic Hexagonalist Pattern No Background
Source GDJ
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ