Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
Prismatic Hexagonalist Pattern No Background
Source GDJ
Element of beach pattern with background.
Source Rones
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon