From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Embossed lines and squares with subtle highlights.
Source Alex Parker
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Geometric triangles seem to be quite hot these days.
Source Pixeden
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
A bit strange this one, but nice at the same time.
Source Diogo Silva
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez