A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
An abstract web texture of a polished blue stone (or does it look more like ice).
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
Prismatic Hexagonalist Pattern No Background
Source GDJ
Prismatic Snowflakes Pattern No Background
Source GDJ
This one needs to be used in small areas; you can see it repeat.
Source Luca
Seamless Green Tile Background
Source V. Hartikainen
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin