Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Used a cherry by doctormo to make this seamless pattern
Source Firkin
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
A version without colours blended together to give a different look.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Light and tiny, just the way you like it.
Source Rohit Arun Rao
The image depicts polka dot seamless pattern.
Source Yamachem
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc