A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Gold Triangular Seamless Pattern No Background
Source GDJ
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Black And White Floral Pattern Background Inverse
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
A seamless texture of a rough concrete surface.
Source V. Hartikainen
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
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
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin