Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. Version with black background.
Source Firkin
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Classic 45-degree pattern, light version.
Source Luke McDonald
Psychedelic Geometric Background No Black
Source GDJ
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Used a cherry by doctormo to make this seamless pattern
Source Firkin
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Classic vertical lines, in all its subtlety.
Source Cody L
Sort of reminds me of those old house wallpapers.
Source Tish
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo