From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein