Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Green Background Pattern
Source V. Hartikainen
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
White circles connecting on a light gray background.
Source Mark Collins
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A seamless background texture of old cardboard.
Source V. Hartikainen
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß