Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Subtle scratches on a light gray background.
Source Andrey Ovcharov
A brown metallic grid pattern layered on top of a dark fabric texture. It should look great when using as a tiled background on web pages, especially blogs.
Source V. Hartikainen
Prismatic Abstract Background Design
Source GDJ
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
Prismatic Polyskelion Pattern No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien