A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Prismatic Hypnotic Pattern No Background
Source GDJ
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Kaleidoscope Prismatic Abstract No Background
Source GDJ
One more sharp little tile for you. Subtle circles this time.
Source Blunia
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
A simple bump filter made upon request at irc #inkscape at freenode. Made a screen capture of the making here: https://youtu.be/TGAWYKVLxQw
Source Lazur URH
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Abstract Ellipses Background Grayscale
Source GDJ
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
Source V. Hartikainen
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Background formed from the original with an emboss effect
Source GDJ
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin