This was formed by distorting an image of a background on Pixabay.
Source Firkin
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
Zero CC tileable ground cracked, crackled, texture, made by me.
Source Sojan Janso
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
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
Black brick wall pattern. Brick your site up!
Source Alex Parker
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
A seamless background texture of old cardboard.
Source V. Hartikainen
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
A pattern formed from repeated instances of corner decoration 8. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin