This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
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
From a drawing in 'La Principauté de Liège et les Pays-Bas au XVIe siècle', Société des Bibliophiles Liégeois ,1887.
Source Firkin
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ
Element of beach pattern with background.
Source Rones
Background formed from the original with an emboss effect
Source GDJ
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady