A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Prismatic Groovy Concentric Background No Black
Source GDJ
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Original seamless pattern with an Inkscape filter.
Source Firkin
A background tile of dark textile. Made this a long time ago and just now decided to publish it.
Source V. Hartikainen
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Abstract Background Design No Black
Source GDJ
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Seamless Light Background Texture.
Source V. Hartikainen