Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Prismatic Groovy Concentric Background 2
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. Version with black background.
Source Firkin
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
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
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
Abstract Tiled Background Extended 8
Source GDJ
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Prismatic Abstract Geometric Background 2
Source GDJ
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
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
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
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
This background has abstract texture with some similarities to wood.
Source V. Hartikainen