From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Embossed lines and squares with subtle highlights.
Source Alex Parker
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
A pattern formed from repeated instances of corner decoration 8. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Alternative colour scheme to the original.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
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
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
A comeback for you: the popular Escheresque, now in black.
Source Patten
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A background pattern with blue on white vertical stripes.
Source V. Hartikainen