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Hi Joe, and Qasir.
WSUP Bangladesh and WaterAid Bangladesh have just been doing this in Dhaka. See link below for some examples of the artwork and a brief explanation:
https://www.wsup.com/2014/09/03/art-for-behaviour-change-in-bangladesh/
If this is useful, I'm sure someone from the Bagladesh team would be happy to give more detail.
Best wishes, Gemma