Alternative colour scheme. 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
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin