An attempt for cleaning up the original image in a few steps.
Source Lazur URH
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
Spice up your next school project with this icon background.
Source Swetha
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Prismatic Curved Diamond Pattern No Background
Source GDJ
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso