This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
CC0 and seamless wellington boot pattern.
Source SliverKnight
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
A nice and simple white rotated tile pattern.
Source Another One
Retro Circles Background 8 No Black
Source GDJ
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Prismatic Snowflakes Pattern No Background
Source GDJ
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Utilising a bird from s-light and 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 4 No Background
Source GDJ
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Lovely pattern with splattered vintage speckles.
Source David Pomfret
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
Prismatic Hypnotic Pattern No Background
Source GDJ
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß