Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen
A blue gray fabric-like texture for websites. An yet another fabric-like texture. It has subtle vertical and diagonal stripes to it.
Source V. Hartikainen
The base gradient edited so now more details are rendered.
Source Lazur URH
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Dark blue concrete wall with some small dust spots.
Source Atle Mo
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav