Prismatic Geometric Pattern Background 2 No Black
Source GDJ
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
The image depicts polka dot seamless pattern.
Source Yamachem
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Prismatic Floral Background No Black
Source GDJ
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin