From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
A nice and simple white rotated tile pattern.
Source Another One
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Abstract Tiled Background Extended 8
Source GDJ