A pale olive green background with a seamless texture.
Source V. Hartikainen
From an image on opengameart.org shared by rubberduck.
Source Firkin
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
This one is quite simple in design, it consists of vertical stripes layered on top of a seamless texture.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
A seamless striped fabric-like texture colored in a dark reddish brown color.
Source V. Hartikainen
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso