I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
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
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
A bit of scratched up grayness. Always good.
Source Dmitry
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen