Motomedia in the UK have an interesting approach to any shopping malls that have empty retail units – use them as giant advertising hoardings.
Their latest window-poster features Shayne Ward (a previous X-Factor TV winner I am told) at the Arndale Centre in Manchester.
A rear projection system shows video and their is sound also – although I feel that there is an opportunity here to put something larger in the window, like ITrans as used in the Virgin Megastore windows.
http://www.motomedia-uk.com [1]
This is a business model that can work anywhere in EMEA so start speaking to your local Shopping Mall / Property Group.