Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
The following free background pattern has glossy diagonal stripes as a texture to it, and it's colored in a light blue gray color. This background pattern is suitable for using in web design or any other graphic design projects. This applies to all background patterns here.
Source V. Hartikainen
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
Prismatic Geometric Pattern Background No Black
Source GDJ
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Prismatic Hexagonalism Pattern No Background
Source GDJ
Retro Circles Background 4 No Black
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Medium gray pattern with small strokes to give a weave effect.
Source Catherine