A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
It looks very nice I think.
Source V. Hartikainen
Prismatic Geometric Pattern Background
Source GDJ
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A version without colours blended together to give a different look.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin