To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Continuing the geometric trend, here is one more.
Source Mike Warner
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
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
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Prismatic Geometric Pattern Background 2
Source GDJ
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin