A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
A seamless texture of an abstract wall colored in shades of light orange brown.
Source V. Hartikainen
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
Prismatic Polka Dots 3 No Background
Source GDJ
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Prismatic Groovy Concentric Background 5
Source GDJ
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
A bit of scratched up grayness. Always good.
Source Dmitry