Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
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
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Inspired by this, I came up with this pattern. Madness!
Source Atle Mo
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
A version without colours blended together to give a different look.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Prismatic Groovy Concentric Background 2
Source GDJ
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim