A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Prismatic Groovy Concentric Background 3
Source GDJ
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
Prismatic Basic Pattern 2 No Background
Source GDJ
Prismatic Groovy Concentric Background 2
Source GDJ
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This background pattern has futuristic look. So, maybe it could be used on websites or blogs dedicated to video games?!
Source V. Hartikainen
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova