Could be paper, could be a Polaroid frame – up to you!
Source Chaos
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
This one looks like a cork panel. Feel free to use it as a tiled background on your blog or website.
Source V. Hartikainen
The image is a seamless pattern of a fishnet.
Source Yamachem
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
From a drawing in 'From Snowdon to the Sea. Striking stories of North and South Wales', Marie Trevelyan, 1895.
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin