I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
Colorful Floral Background No Black
Source GDJ
Black And White Floral Pattern Background from PDP.
Source GDJ
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A free seamless background with pink spots.
Source V. Hartikainen
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin