This is sort of fresh, but still feels a bit old school.
Source Martuchox
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A repeating background with seamless texture of stone. There haven't been any stone-like backgrounds for a while, so I have decided to create one more. The rest can be found in the appropriate category.
Source V. Hartikainen
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
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
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
One more sharp little tile for you. Subtle circles this time.
Source Blunia
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
Prismatic Polyskelion Pattern No Background
Source GDJ
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective