Might not be super subtle, but quite original in its form.
Source Alex Smith
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
The image is the remix of "wire-mesh fence seamless pattern" .This is a more minute version of it.Sorry for the file size.Using path>difference in Inkscape, I will cut out any silhouette from this pattern and create a "meshed silhouette".
Source Yamachem
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
This is the remix of "blue wave-seigaiha".The image depicts a seamless pattern of the front upper part of Japanese five yen coin which is used currently.This design represents a rice with ripe golden ears.
Source Yamachem
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
An aged paper background tile with smeared and pressed text.
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
Embossed lines and squares with subtle highlights.
Source Alex Parker
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous