Ideas for campaign extension

So, the campaign posters sort of reminded me of a calendar. And I thought I could connect the 17p/day to the 30/31 days of a calendar. And use that further to expand the campaign.

For other media, I'm looking at smart technology like iPhone applications, Mobile Advertising (SMS/MMS), Online, etc.

Here are a few iPhone applications that I liked and could use as references for my campaign.