A light background pattern with diagonal stripes. Here's a simple light striped background for you.
Source V. Hartikainen
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
You know you love wood patterns, so here’s one more.
Source Richard Tabor
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857
Source Firkin
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. Version with black background.
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
Prismatic Groovy Concentric Background 3
Source GDJ
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin