That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
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
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
This is the remix of an OCAL clipart called "Art Nouveau ornament" uploaded by "microcosme".Thanks.This is a seamless pattern of an Art Nouveau ornament.
Source Yamachem
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Retro Circles Background 8 No Black
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin