This is sort of fresh, but still feels a bit old school.
Source Martuchox
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
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
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak