Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4
Source GDJ
Light and tiny, just the way you like it.
Source Rohit Arun Rao
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Continuing the geometric trend, here is one more.
Source Mike Warner
A white version of the very popular linen pattern.
Source Ant Ekşiler
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker