The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Gamedev - Metal Textures. CC0 License.
Source Davit Masia
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
You guessed it – looks a bit like cloth.
Source Peax Webdesign
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Alternative colour scheme.
A repeating background of beige (or is it more vanilla yellow) textured stripes. One more background with stripes.
Source V. Hartikainen
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Incoming catena. Stone & well. CC0 texture.
A seamless floral pattern.
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Seamless pattern the tile.
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Filter simulating the texture of heavy paper.
Floors-Tiles. CC0 License.
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Remixed from a drawing in 'Canadian forest industries July-December', 1915
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Sharp but soft triangles in light shades of gray.
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
Remixed from an image that was uploaded to Pixabay by Pixeline
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Tiny dark square tiles with varied color tones.
Alternative colour scheme