A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
There are many carbon patterns, but this one is tiny.
Source Designova
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
Neat little photography icon pattern.
Source Hossam Elbialy
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
Prismatic Groovy Concentric Background 4
Source GDJ
Prismatic Chevrons Pattern 5 With Background
Source GDJ
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
Embossed lines and squares with subtle highlights.
Source Alex Parker
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
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett