To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This one needs to be used in small areas; you can see it repeat.
Source Luca
Prismatic Groovy Concentric Background No Black
Source GDJ
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Retro Circles Background 4 No Black
Source GDJ
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
Prismatic Hexagonalist Pattern No Background
Source GDJ
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
Prismatic Polyskelion Pattern No Background
Source GDJ
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo