In the countryside in Japan, some old-timers still use old tea leaves for cleaning up: They sprinkle the still-damp leaves on the floor and push them around with a broom. Dust and other dirt cling to the leaves, which can then be pushed into a pile and then into a dust pan. At this point, most folks will then throw the tea leaves into the family garden as an organic fertilizer. Nothing goes to waste!
(Just remember, however, that tea can stain carpets and unfinished wood.)