The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
The original enhanced with some gradients.
Source Firkin
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Kaleidoscope Prismatic Abstract No Background
Source GDJ
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
To celebrate the new feature, we need some sparkling diamonds.
Source Atle Mo
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo