Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Embossed lines and squares with subtle highlights.
Source Alex Parker
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
A comeback for you: the popular Escheresque, now in black.
Source Patten
Oh yes, it happened! A pattern in full color.
Source Atle Mo
A free background pattern with abstract green tiles.
Source V. Hartikainen
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Retro Circles Background 5 No Black
Source GDJ
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Prismatic Groovy Concentric Background 5
Source GDJ