Sort of reminds me of those old house wallpapers.
Source Tish
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
Prismatic Groovy Concentric Background
Source GDJ
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
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
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
A seamless background pattern with a texture of wood planks. This wood background pattern has vertically arranged planks. You may try to rotate it 90°, to see how it will look like when the wood planks are arranged horizontally.
Source V. Hartikainen
White handmade paper pattern with small bumps.
Source Marquis
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
8 by 8 pixels, and just what the title says.
Source pixilated
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel