Been eyeballing wall space since Banksy went all mainstream but waiver every time you pass the art supplies shop? Augmented reality to the rescue with Channel Four's new graffiti app – Street Tag – free for iPhone, iPod Touch and iPad 2.
Point your iPhone camera at your house, office or local sacred landmark and choose the colour, size and wetness of your spray can paint to create your "tag". Give the can a shake (the rattling sound is a nice touch), then geo-tag your masterpiece on the Street Tag map or share to Facebook and Twitter for the world to fawn over. So. Very. Urban.