Geometric triangles seem to be quite hot these days.
Source Pixeden
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)
Source V. Hartikainen
White circles connecting on a light gray background.
Source Mark Collins
A repeating background with a look of paper. I have added some changes to PatCreator. Now you can share your designs by submitting them to a new gallery section. Start by clicking Edit with PatCreator above.
Source V. Hartikainen
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
A seamless paper background colored in pale yellow.
Source V. Hartikainen