A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
This seamless light brown background texture resembles a wallpaper with vertical stripes. One way to use it is as a tiled background on web sites.
Source V. Hartikainen
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Background formed from the original with an emboss effect
Source GDJ
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
Prismatic Abstract Background Design
Source GDJ
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-brown.
Source Yamachem
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
The tile this is based on was adapted from an image that was uploaded to Pixabay by frolicsomepl. It can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
A seamless tessellation pattern. To get the tile this is formed from, select the pattern in Inkscape and use shift+alt+i.
Source Firkin