This is a hot one. Small, sharp and unique.
Source GraphicsWall
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
A bit strange this one, but nice at the same time.
Source Diogo Silva
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Colorful Floral Background No Black
Source GDJ
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin