Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Almost like little fish shells, or dragon skin.
Source Graphiste
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
This is a remix of "geometrical pattern 01".
Source Yamachem
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker