Colourful background achieved with gradient fills.
Source Firkin
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Prismatic Curved Diamond Pattern No Background
Source GDJ
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem