The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Psychedelic Geometric Background No Black
Source GDJ
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin