The Alternative Vote referendum campaign seemed to kick-off in earnest over the weekend.
The NotoAV campaign have released a poster template which encourages people to generate their own adverts and spread them via social media.
It’s not a bad effort, but it leaves quite a lot of work (creative and technical) for someone to able to make something that they would be happy to pass on to their friends.
I imagine a mydavidcameron-esque site will crop up sooner or later.
UPDATE – Here’s a couple of examples I’ve happened upon that have been created by the official campaign:
politicaladvertising.co.uk 
Luckily, somebody made a computerised version to make it easier: http://av.argh.tc/o-matic/