Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Almost like little fish shells, or dragon skin.
Source Graphiste
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
Prismatic Floral Background No Black
Source GDJ
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Prismatic Geometric Pattern Background 2
Source GDJ
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin