A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
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
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
A seamless striped fabric-like texture colored in a dark reddish brown color.
Source V. Hartikainen
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan