Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Prismatic Geometric Pattern Background 2
Source GDJ
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This is sort of fresh, but still feels a bit old school.
Source Martuchox
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
A nice and simple white rotated tile pattern.
Source Another One
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
From a drawing in 'Hundert Jahre in Wort und Bild', S. Stefan, 1899.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry