common or garden cows
Meaning: ordinary; unexeptional
Believe it or not, cows were once a familiar sight on the streets of east London. They would be grazed on the common land of Epping Forest in spring to autumn, but would often wander off into the surrounding suburbs where they would get up to all sorts of mischief causing traffic jams and getting into people's gardens.
All paintings below are from the book 'Common or Garden Cows', out now from 'Shop'. Prints are also available.