Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
Prismatic Abstract Geometric Background 5
Source GDJ
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Continuing the geometric trend, here is one more.
Source Mike Warner
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Prismatic Groovy Concentric Background 4
Source GDJ
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
A version without colours blended together to give a different look.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen