Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
I’m not going to use the word Retina for all the new patterns, but it just felt right for this one. Huge wood pattern for ya’ll.
Source Atle Mo
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Seamless Green Tile Background
Source V. Hartikainen