Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Subtle scratches on a light gray background.
Source Andrey Ovcharov
The original enhanced with one of Inkscapes's filters.
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ
Original seamless pattern with an Inkscape filter.
Source Firkin
A browner version of the original weathered fence texture.
Source Firkin
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
Oh yes, it happened! A pattern in full color.
Source Atle Mo
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Tile-able Dark Brown Wood Background. Feel free to use it as a background image in your designs or somewhere on the web. By the way, the color seems to be close to Coffee Brown.
Source V. Hartikainen
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk