Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Black version of a pattern that came out of playing with the 'light rays' plug-in for 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
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
Colorful Floral Background 3 No Black
Source GDJ
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin