Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Here's a new gray "fabric" pattern. Use it as backgrounds for websites or for other purposes.
Source V. Hartikainen
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Prismatic Groovy Concentric Background 5
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