This is so easy to make and smells absolutely lovely. It even gets rid of the smell of wood smoke form the wood burners. It is relatively cheap too as long as you have the spices in the cupboard.

1 orange sliced
1 cinnamon stick
2 star anise
4 cloves
1 pint of water

Place all ingredients in a pan and boil. Turn down the heat once boiling to keep a steady simmer.
The smell filters through the house and smells fantastic.
When you have finished with it, jar it and store in the fridge, you can use it up to 3 / 4 times as it doesn´t lose its smell.