This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
An alternative colour scheme to the original seamless pattern.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
Psychedelic Geometric Background No Black
Source GDJ
Prismatic Hexagonalist Pattern No Background
Source GDJ
Prismatic Geometric Pattern Background No Black
Source GDJ
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
This one is quite simple in design, it consists of vertical stripes layered on top of a seamless texture.
Source V. Hartikainen
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin