Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
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
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Run a restaurant blog? Here you go. Done.
Source Andrijana Jarnjak
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Sometimes you just need the simplest thing.
Source Fabricio
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler