The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
Abstract Tiled Background Extended 10
Source GDJ
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Plywood Web Background background image for use in web design.
Source V. Hartikainen
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Sharp pixel pattern, just like the good old days.
Source Paridhi
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen