Not so subtle. These tileable wood patterns are very useful.
Source Elemis
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
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
A pale orange background pattern with glossy groove stripes.
Source V. Hartikainen
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo