Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin