From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
A comeback for you: the popular Escheresque, now in black.
Source Patten
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
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
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Hexagonalism Pattern No Background
Source GDJ
A pale orange background pattern with glossy groove stripes.
Source V. Hartikainen
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Prismatic Polyskelion Pattern No Background
Source GDJ
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
Prismatic Hexagonalist Pattern No Background
Source GDJ