Background pattern originally a PNG drawn in Paint.net
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
A repeating gloomy background image. This one consists of a pattern of black chains layered on top of a dark textured background.
Source V. Hartikainen
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless paper background colored in pale yellow.
Source V. Hartikainen
The following free background pattern has glossy diagonal stripes as a texture to it, and it's colored in a light blue gray color. This background pattern is suitable for using in web design or any other graphic design projects. This applies to all background patterns here.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley