Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Prismatic Curved Diamond Pattern 4 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
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A textured orange background pattern with vertical stripes.
Source V. Hartikainen