Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Might not be super subtle, but quite original in its form.
Source Alex Smith
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Prismatic Groovy Concentric Background 4
Source GDJ
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Number five from the same submitter, makes my job easy.
Source Dima Shiper
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Prismatic Snowflakes Pattern No Background
Source GDJ