Background pattern originally a PNG drawn in Paint.net
Source Firkin
A pattern drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Original minus the background
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ
A seamless pattern of leopard skin. It should look nice as a background element on web pages.
Source V. Hartikainen
Embossed lines and squares with subtle highlights.
Source Alex Parker
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
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin