A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
ZeroCC tileable moss texture, photographed and made by me. CC0
Source Sojan Janso
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
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 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba