With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Prismatic Groovy Concentric Background 5
Source GDJ
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
A repeating gloomy background image. This one consists of a pattern of black chains layered on top of a dark textured background.
Source V. Hartikainen
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Prismatic Abstract Geometric Background 3
Source GDJ
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
This background texture resembles stone. It may be used as a background on web pages or on some of their html elements (header, borders, menu bar, etc.). Just modify it for your needs.
Source V. Hartikainen
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
An abstract web texture of a polished blue stone (or does it look more like ice).
Source V. Hartikainen
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein