A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Prismatic Basic Pattern 2 No Background
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Looks like an old wall. I guess that’s it then?
Source Viahorizon
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
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin