From an image on opengameart.org shared by rubberduck.
Source Firkin
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A nice and simple white rotated tile pattern.
Source Another One
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Embossed lines and squares with subtle highlights.
Source Alex Parker
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Prismatic Groovy Concentric Background
Source GDJ
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Prismatic Abstract Background Design
Source GDJ
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A comeback for you: the popular Escheresque, now in black.
Source Patten
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee