A comeback for you: the popular Escheresque, now in black.
Source Patten
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
The name is totally random, but hey, it sounds good.
Source Atle Mo
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
Prismatic Abstract Geometric Background 5
Source GDJ
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen