8 by 8 pixels, and just what the title says.
Source pixilated
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Background formed from the original with an emboss effect.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Oh yes, it happened! A pattern in full color.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Subtle scratches on a light gray background.
Source Andrey Ovcharov
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
There are many carbon patterns, but this one is tiny.
Source Designova
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
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Same classic 45-degree pattern, dark version.
Source Luke McDonald
A light gray background pattern with seamless fabric-like texture and almost unnoticeable stripes.
Source V. Hartikainen
Abstract Ellipses Background Grayscale
Source GDJ
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
Might not be super subtle, but quite original in its form.
Source Alex Smith
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ