This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Background formed from the original with an emboss effect
Source GDJ
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
This one needs to be used in small areas; you can see it repeat.
Source Luca
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
A comeback for you: the popular Escheresque, now in black.
Source Patten
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
This one is amazing, truly original. Go use it!
Source Viahorizon
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova