Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
This is sort of fresh, but still feels a bit old school.
Source Martuchox
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Prismatic Hexagonalism Pattern No Background
Source GDJ
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Derived from a drawing in 'Elfrica. An historical romance of the twelfth century', Charlotte Boger, 1885
Source Firkin
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec