I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
Prismatic Hexagonalism Pattern No Background
Source GDJ