From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
CC0 and seamless wellington boot pattern.
Source SliverKnight
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
This is a hot one. Small, sharp and unique.
Source GraphicsWall
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Continuing the geometric trend, here is one more.
Source Mike Warner
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
ZeroCC tileable moss texture, photographed and made by me. CC0
Source Sojan Janso
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Abstract Tiled Background Extended 12
Source GDJ
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Prismatic Abstract Background Design No Black
Source GDJ
Embossed lines and squares with subtle highlights.
Source Alex Parker
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Neat little photography icon pattern.
Source Hossam Elbialy
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin