From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Looks like an old wall. I guess that’s it then?
Source Viahorizon
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. A version of the original with random colors.
Source Firkin
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Classic vertical lines, in all its subtlety.
Source Cody L
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin