A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A seamless texture of an abstract wall colored in shades of light orange brown.
Source V. Hartikainen
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
A free background pattern with abstract green tiles.
Source V. Hartikainen