I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Prismatic Floral Background No Black
Source GDJ
Prismatic Hexagonalist Pattern No Background
Source GDJ
A light background pattern with diagonal stripes. Here's a simple light striped background for you.
Source V. Hartikainen
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
I’m not going to lie – if you submit something with the words Norwegian and Rose in it, it’s likely I’ll publish it.
Source Fredrik Scheide
A comeback for you: the popular Escheresque, now in black.
Source Patten
This one has rusty dark brown texture.
Source V. Hartikainen
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Retro Circles Background 4 No Black
Source GDJ
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
A brown metallic grid pattern layered on top of a dark fabric texture. It should look great when using as a tiled background on web pages, especially blogs.
Source V. Hartikainen
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin