The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A nice and simple white rotated tile pattern.
Source Another One
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A free seamless texture of reptile skin colored in a dark brown color. As always, you may use it as a repeated background image in your web design works, or for any other purposes.
Source V. Hartikainen
This is the remix of "blue wave-seigaiha".The image depicts a seamless pattern of the front upper part of Japanese five yen coin which is used currently.This design represents a rice with ripe golden ears.
Source Yamachem
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Prismatic Hypnotic Pattern No Background
Source GDJ
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso