We at Ozonetel have been working with Unilever since last couple of years. We have worked on them with innovative products like Kan Khajura Tesan and multiple on pack campaigns.
Now we are partnering with them for a hackathon . So FMCGs also are on the hackathon  bandwagon to encourage innovation :)
So, Want to gamify  consumer behavior? Use KooKoo cloud telephony and show to Unilever. This is a very good way to get noticed by Unilever.
Build missed call based games. Connect to  celebrities. Mix offline and online worlds by creating a pack based game. Build a phone based Tinder for Axe . Create a phone regime for shining hair using TREsemme. Change behavior and make people brush at night for Pepsodent. The ideas are limitless.
Contest details are at https://www.hackerearth.com/sprints/hul-hackathon-powered-by-ozontel/