I'll be attending AFOLCON and BRICK 2014 at Excel, London from the 25th-29th November to promote Stack Exchange.
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You may be able to find me, I will be wearing the black Stack Exchange t-shirt as shown above and I've been given 200 Stack Exchange stickers to hand out.
If you or someone you know is displaying a model at the convention, these stickers are the perfect size for LEGO size billboards, train carriages, shipping containers etc.
I found a set of reusable plastic stickers (the kind that just cling to smooth surfaces) once. It was specifically designed for use with Lego; there were torso-sized ones, various tile-sized ones, and larger ones, for adding street signs, household items, etc, to Lego builds.
Unfortunately I was disappointed with the quality of the artwork