Geometric triangles seem to be quite hot these days.
Source Pixeden
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Prismatic Floral Background No Black
Source GDJ
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
White little knobs, coming in at 10x10px. Sweet!
Source Amos
A classic dark tile for a bit of vintage darkness.
Source Listvetra
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
It looks very nice I think.
Source V. Hartikainen
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
A black tile-able background with paper-like texture.
Source V. Hartikainen
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
Sharp pixel pattern, just like the good old days.
Source Paridhi
Prismatic Polka Dots Mark II No Background
Source GDJ
Dark blue concrete wall with some small dust spots.
Source Atle Mo