I recently got an email from BurningMan.com with this contest info:

It’s that time of year again – time for our annual sticker contest!

This is the official call for designs for the 2008 Burning Man stickers
that are passed out with the materials you receive at the Greeters
station in Black Rock City. (and other designs that appear randomly in
your hands at other points in time)

These stickers are two or three colors and can vary in size from 2.25″
by 5.5″ to 3″ by 3″ or 3″ in diameter for a round design. Please
incorporate the name Burning Man and the year 2008 into your design.
These are two or three color stickers only so please design accordingly.

If at all possible, please post your design on a web page and send the
URL to Bex; otherwise send in a color separated vector Adobe Illustrator
file to bex@burningman.com. Whether sending your design or questions,
please put “STICKER DESIGN” in the subject header. HEY, remember there
IS a theme, and we like stickers that attempt to use the theme – this
year’s theme is: The American Dream.

We are also looking for designs for the 2008 car stickers. This sticker
is traditionally a car window sticker that will be printed on clear
vinyl and in two colors.
Please make sure designs contain the Burning Man name and the year 2008.
Designs should be 2″ by 2″ or 2″ diameter if round. If at all possible,
please post your design on a web page and send the URL to Bex; otherwise
send in a color separated vector Adobe Illustrator file to
bex@burningman.com. Please put “STICKER DESIGN” in the subject header.
Ditto here on the theme!

More info on the Theme:
www.burningman.com/

The deadline for design submissions is Monday June 16th, 2008.

Please note that all artwork selected for stickers needs to be submitted
in a color separated vector Illustrator file in the actual size the
sticker is to be produced.