I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
The image depicts a tiled seamless pattern.The tile represents four leaves aligned every 90 ° , which may look like a bird or a dragon .The original leaf design is from a Japanese old book.
Source Yamachem
Prismatic Abstract Background Design
Source GDJ
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
Prismatic Groovy Concentric Background No Black
Source GDJ
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa