Put the milk chocolate into a heatproof bowl over a pan of simmering water, and melt carefully.
Dip the strawberries into the chocolate, then put on a piece of greaseproof paper to set.
Melt the white chocolate in the same way as the milk. Carefully spoon into a piping bag – if you don't have one add to a plastic sandwich bag and snip a small hole off one of the corners.
Pipe an American football design on to each strawberry and allow to set on more greaseproof paper before serving.