From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
A free background pattern with abstract green tiles.
Source V. Hartikainen
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
One more sharp little tile for you. Subtle circles this time.
Source Blunia
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
Abstract Tiled Background Extended 8
Source GDJ
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
Prismatic Geometric Pattern Background No Black
Source GDJ
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamlessly tile-able grunge background image.
Source V. Hartikainen
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso