Might not be super subtle, but quite original in its form.
Source Alex Smith
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
The following free background pattern has glossy diagonal stripes as a texture to it, and it's colored in a light blue gray color. This background pattern is suitable for using in web design or any other graphic design projects. This applies to all background patterns here.
Source V. Hartikainen
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin