Here is a great example from Natan Jewelry Shop (Sao Paulo, Brazil) of guerrilla marketing. The company did a great job using promotional stickers or decals in order to show their female target market how beautiful the jewelry would look on them.
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The Australian Public Transport Authority got tired of people spray-painting graffiti on their buses and trains, so they targeted the ‘graffidiots’ with this ad campaign that reminds would-be vandals what the consequences of their actions could be.
"This one is an IBM smart cities campaign product/ad. It is great because it is intelligently complementing the ad with the functionality of the design, so perfectly that the audience really gets the idea of the “Smarter Cities” out of this design.