No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
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
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Prismatic Basic Pattern 2 No Background
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Background formed from the original with an emboss effect
Source GDJ