Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Fix side and a seamless pattern formed from circles.
Source SliverKnight
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
This white background pattern has a seamless grunge style texture. Here's a white grunge style background pattern. Use it as a tiled background image on web sites or for other purposes.
Source V. Hartikainen
Classic vertical lines, in all its subtlety.
Source Cody L
Background pattern originally a PNG drawn in Paint.net
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
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 2 No Background
Source GDJ
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim