Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Sometimes you just need the simplest thing.
Source Fabricio
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
A black tile-able background with paper-like texture.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
This one is amazing, truly original. Go use it!
Source Viahorizon
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Colorful Floral Background 3 No Black
Source GDJ
Black brick wall pattern. Brick your site up!
Source Alex Parker
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen