To gain approval from another, usually a superior.
Bringing home flowers is a good way to win brownie points with the wife.
Browine is a house spirit in Scottish superstition. In England he is called Robin Goodfellow. His favorite abodes are farms, and at night he is said to busy himself doing little jobs for the family over which he presides. Although he was neverseen, families often left offerings to show their thanks.
Brownies is club for young girls, not yet old enough to be Girl Scouts or Girl Guides in England. Brownies are awarded bonus points for good behavior and achievements.