A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Background formed from the original with an emboss effect
Source GDJ
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
Element of beach pattern with background.
Source Rones
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Prismatic Groovy Concentric Background 2
Source GDJ
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel