A seamless web background with texture of aged grid paper.
Source V. Hartikainen
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Looks like an old wall. I guess that’s it then?
Source Viahorizon
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Alternative colour scheme for the original floral pattern.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki