Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
A repeating gloomy background image. This one consists of a pattern of black chains layered on top of a dark textured background.
Source V. Hartikainen
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks