As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Prismatic Geometric Pattern Background No Black
Source GDJ
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
This light background pattern has a texture of "frozen" surface with diagonal stripes. Here's an yet another addition to the collection of free website backgrounds.
Source V. Hartikainen
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Colourful background achieved with gradient fills.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin