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
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
8 by 8 pixels, and just what the title says.
Source pixilated
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Prismatic Groovy Concentric Background 4
Source GDJ
Prismatic Abstract Line Art Pattern Background
Source GDJ
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
A seamlessly tileable pink background texture.
Source V. Hartikainen
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Abstract Tiled Background Extended 11
Source GDJ
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin