Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
A black tile-able background with paper-like texture.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso