Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
A chequerboard pattern with a fruit theme. The fruits are from a posting by inkscapeforum.it.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Remixed 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
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight