White circles connecting on a light gray background.
Source Mark Collins
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
You guessed it – looks a bit like cloth.
Source Peax Webdesign
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
Continuing the geometric trend, here is one more.
Source Mike Warner
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Classic vertical lines, in all its subtlety.
Source Cody L
A background pattern with wavy green vertical stripes. This one has green stripes on a white background. Download if you like it.
Source V. Hartikainen
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
A gray background pattern with a texture of textile. Suits perfectly for web design.
Source V. Hartikainen
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.
Source V. Hartikainen
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
A background tile for web with abstract repeating texture of dark "stone wall".
Source V. Hartikainen
The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin