On the 17th of September this year, Brisbane held PARKing day. The principle behind this day is the consideration of how much green space we could have in the city if we didn't drive our cars to work and car parks were converted to lovely green spaces. Brisbane City Council was on board with this initiative (along with other companies and groups) and assisted with converting some of the inner city carparking spaces into lovely temporary green spaces for the day.
Additional information can be found on the following website: http://www.brisbaneparkingday.com/ and there are links to other pages with photos from this base page. Some of the spots look pretty cool and enticing. The only thing I am disappointed about is to find out about this after the fact and not being able to participate.