From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
CC0 and seamless wellington boot pattern.
Source SliverKnight
Someone was asking about how to achieve a fur pattern at #inkscape irc so tried to make a filter on it. Flood filled fractal noises rigged together. May someone find a good use for these.
Source Lazur URH
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin