The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
Green Web Background, Seamless tile.
Source V. Hartikainen
A classic dark tile for a bit of vintage darkness.
Source Listvetra
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
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 dark metal plate with an embossed grid pattern and a bit of rust. Here's a dark metal plate texture for use as a tiled background on web pages.
Source V. Hartikainen
Prismatic Polka Dots Mark II No Background
Source GDJ
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen