To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
A black tile-able background with paper-like texture.
Source V. Hartikainen
Prismatic Hexagonalism Pattern No Background
Source GDJ
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
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
Continuing the geometric trend, here is one more.
Source Mike Warner
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
This white background pattern has a seamless grunge style texture. Here's a white grunge style background pattern. Use it as a tiled background image on web sites or for other purposes.
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight