i used to wonder whether there are any easy and natural way to repel mosquitoes (apart from keeping your surroundings clean). here is an interesting article from ibnlive which tells that elephant dung can be used to repel mosquitoes effectively.

"Elephant dung is the cheapest mosquito repellent. And like herbal medicines, it has no side effects," says Maheshwar Rai, a cattle farmer who bought five kg for Rs.20.

Rai said that he would use the dung "to save my family and half a dozen cows from the mosquito menace, which becomes very bad in early winter".