As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A black tile-able background with paper-like texture.
Source V. Hartikainen
White circles connecting on a light gray background.
Source Mark Collins
This is a remix of "flower seamless pattern".I rotated the original image by 90 degrees.This is a seamless pattern of flowers.These horizontal wavy lines are one of Edo patterns which is called "tatewaku or tachiwaku or 立湧" that represents uprising steam or vapor.
Source Yamachem
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
This was formed by distorting an image of a background on Pixabay.
Source Firkin
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.
Source V. Hartikainen