From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
A bit of scratched up grayness. Always good.
Source Dmitry
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
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
Prismatic Geometric Pattern Background
Source GDJ
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Geometric triangles seem to be quite hot these days.
Source Pixeden
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin