The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
The image depicts a tiled seamless pattern.The tile represents four leaves aligned every 90 ° , which may look like a bird or a dragon .The original leaf design is from a Japanese old book.
Source Yamachem
A seamless texture of black leather. I think it will look best when used in headers, footers or sidebars.
Source V. Hartikainen
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Derived from a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin