Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
A pale olive green background with a seamless texture.
Source V. Hartikainen
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman