A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
This was formed by distorting an image of a background on Pixabay.
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
A background tile for web with abstract repeating texture of dark "stone wall".
Source V. Hartikainen
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab