Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A seamlessly tile-able grunge background image.
Source V. Hartikainen
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Prismatic Geometric Pattern Background No Black
Source GDJ
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
A light background pattern with diagonal stripes. Here's a simple light striped background for you.
Source V. Hartikainen
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen