Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
This one looks like a cork panel. Feel free to use it as a tiled background on your blog or website.
Source V. Hartikainen
White circles connecting on a light gray background.
Source Mark Collins
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Prismatic Polyskelion Pattern No Background
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin