To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
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
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Similar to original, but without gaps in between the arrows. This seamless pattern was created from a rectangular tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Prismatic Polka Dots 3 No Background
Source GDJ
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin