OK, OK, this isn't graffiti, but 'random street art of the week' sounds a bit naff.
Have you seen these figurines dotted about town? These two are both in the Brick Lane area. We've no idea how many there are, or what exactly they're supposed to represent. Some kind of fanged frog with a penchant for lacklustre heraldry?
They're by an artist called Ron Jonzu, and by the looks of it, he's got more planned for the UK.