I normally do not cover "news" type things on this blog, I have other blogs for that purpose, but this particular story got me to thinking I should give it a try at home. Maybe spend the after noon with my daughter making little seed bombs then going for a walk and letting her "bomb" the neighborhood. One of the few gardening blogs I read on a semi daily basis is Heavy Petal , dedicated to urban gardening and the utilization of small spaces to produce outstanding plants of all varities.
The author appeared on a morning time TV show and showed the hosts how to make "Seed Bombs". Small lumps of clay, compost and seeds that you can then throw around your city. Watch the video and have a look at her site for other Guerrilla Gardening ideas.