This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
Prismatic Hexagonalism Pattern No Background
Source GDJ
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Sort of reminds me of those old house wallpapers.
Source Tish
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
U.S.-based National Fire Protection Association standard fire diamond for flagging risks posed by hazardous materials. The red diamond has a number 0-4 depending on flammability. The blue diamond has a number 0-4 depending on health hazard. The yellow has a number 0-4 depending on reactivity. the white square has a special notice, e.g OX for oxidizer.
Source Firkin