From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen
Prismatic Triangular Background Design Mark II 5
Source GDJ
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Alternative colour scheme for the original floral pattern.
Source Firkin
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
An attempt for cleaning up the original image in a few steps.
Source Lazur URH