Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
To get the repeating unit, select the rectangle in Inkscape and use 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
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
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
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo