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.
Paintings from 'Common or Garden Cows', the forthcoming book out now from 'Shop'.