Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
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
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
This one is amazing, truly original. Go use it!
Source Viahorizon
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem