A free grid paper background pattern for using on web sites.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
A free background pattern with abstract green tiles.
Source V. Hartikainen
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
A version without colours blended together to give a different look.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
It looks very nice I think.
Source V. Hartikainen
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.