From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Just like the black maze, only in light gray. Duh.
Source Peax
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
White circles connecting on a light gray background.
Source Mark Collins
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
I’m not going to use the word Retina for all the new patterns, but it just felt right for this one. Huge wood pattern for ya’ll.
Source Atle Mo
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.
Source Yamachem
This one is amazing, truly original. Go use it!
Source Viahorizon
A free pink background pattern.
Source V. Hartikainen