CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
White circles connecting on a light gray background.
Source Mark Collins
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Oh yes, it happened! A pattern in full color.
Source Atle Mo
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Hexagonalism Pattern No Background
Source GDJ
A version without colours blended together to give a different look.
Source Firkin
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
Zero CC tileable ground (#2) cracked, crackled texture, made by me. CC0
Source Sojan Janso