Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
You may use it as is, or modify it as you like.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Prismatic Abstract Line Art Pattern Background
Source GDJ
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
A seamless pattern of leopard skin. It should look nice as a background element on web pages.
Source V. Hartikainen
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Sharp pixel pattern, just like the good old days.
Source Paridhi
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Oh yes, it happened! A pattern in full color.
Source Atle Mo