Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A seamlessly tileable pink background texture.
Source V. Hartikainen
Prismatic Polyskelion Pattern No Background
Source GDJ
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Fix and cc0 to get the tile this is based on.
Source SliverKnight
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
A seamlessly tile-able grunge background image.
Source V. Hartikainen