As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A background tile for web with abstract repeating texture of dark "stone wall".
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf