Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
This was formed by distorting an image of a background on Pixabay.
Source Firkin
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.
Source V. Hartikainen
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
An aged paper background tile with smeared and pressed text.
Source V. Hartikainen
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter