A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
8 by 8 pixels, and just what the title says.
Source pixilated
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
A background pattern with a look of rough fabric.
Source V. Hartikainen
Number five from the same submitter, makes my job easy.
Source Dima Shiper
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett