A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Retro Circles Background 7 No Black
Source GDJ
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
This one is amazing, truly original. Go use it!
Source Viahorizon
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso