8 by 8 pixels, and just what the title says.
Source pixilated
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
Prismatic Hexagonalism Pattern No Background
Source GDJ
Number five from the same submitter, makes my job easy.
Source Dima Shiper
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin