A seamless tessellation pattern. To get the tile this is formed from, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
A seamless striped fabric-like texture colored in a dark reddish brown color.
Source V. Hartikainen
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
A version without colours blended together to give a different look.
Source Firkin
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
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
Prismatic Polka Dots Mark II No Background
Source GDJ
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton