Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Retro Circles Background 4 No Black
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
There are many carbon patterns, but this one is tiny.
Source Designova
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Prismatic Basic Pattern 2 No Background
Source GDJ
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
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
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten