To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Colourful background achieved with gradient fills.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
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
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida