Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Subtle scratches on a light gray background.
Source Andrey Ovcharov
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.
Source Atle Mo
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
U.S.-based National Fire Protection Association standard fire diamond for flagging risks posed by hazardous materials. The red diamond has a number 0-4 depending on flammability. The blue diamond has a number 0-4 depending on health hazard. The yellow has a number 0-4 depending on reactivity. the white square has a special notice, e.g OX for oxidizer.
Source Firkin
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin