Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
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
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
A bit strange this one, but nice at the same time.
Source Diogo Silva
Prismatic Geometric Pattern Background
Source GDJ
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Black And White Floral Pattern Background Inverse
Source GDJ
Zero CC tileable Crackled Cement (streaks) texture, photographed and made by me. CC0
Source Sojan Janso
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin