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
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A comeback for you: the popular Escheresque, now in black.
Source Patten
Might not be super subtle, but quite original in its form.
Source Alex Smith
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
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
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell