Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A comeback for you: the popular Escheresque, now in black.
Source Patten
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
This is sort of fresh, but still feels a bit old school.
Source Martuchox
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A seamless background tile of aged paper with shabby look.
Source V. Hartikainen
The image depicts a seamless pattern of the design which includes a stylized lotus and a stylized crane.I referred to the original image in a book which is into public domain.
Source Yamachem
The base gradient edited so now more details are rendered.
Source Lazur URH
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
A seamless background of warped stripes on paper.
Source V. Hartikainen
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren