Black And White Floral Pattern Background from PDP.
Source GDJ
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Number five from the same submitter, makes my job easy.
Source Dima Shiper
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Prismatic Curved Diamond Pattern No Background
Source GDJ
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin