From an image on opengameart.org shared by rubberduck.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A seamless pattern formed from background pattern 102
Source Firkin
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Alternative colour scheme for the original floral pattern.
Source Firkin
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Sometimes you just need the simplest thing.
Source Fabricio
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
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
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
Prismatic Polyskelion Pattern No Background
Source GDJ
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
Background pattern originally a PNG drawn in Paint.net
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim