Sometimes you just need the simplest thing.
Source Fabricio
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
This one looks like a cork panel. Feel free to use it as a tiled background on your blog or website.
Source V. Hartikainen
A bit strange this one, but nice at the same time.
Source Diogo Silva
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
This is a seamless pattern of a woody texture.The original image is here:https://pixabay.com/ja/users/ClassicallyPrinted-1302233/
Source Yamachem
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Prismatic Chevrons Pattern 5 With Background
Source GDJ
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Here's a new gray "fabric" pattern. Use it as backgrounds for websites or for other purposes.
Source V. Hartikainen