A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless tessellation pattern. To get the tile this is formed from, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A light gray background pattern with seamless fabric-like texture and almost unnoticeable stripes.
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A free pink background pattern.
Source V. Hartikainen
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim