You can buy scented candles and burn them, or use specially mixed oils in a diffuser. You can also buy potpourris with special Christmas scents and leave them in bowls around the house, mixing every once in a while to refresh the scent. But there's a deliciously simple home-made way to make your house smell like Christmas.
During the Holiday period, whenever you eat an apple or orange, or when you squeeze a lemon, put the various peelings in a pan, alone or mixed together, cover with water, add a cinnamon stick, and one or two cloves, and bring it to the boil. Then turn down the heat and simmer. You can also add a piece of ginger and some cardamom seeds for extra tones.
Keep this potion simmering all day, topping it up with boiling water whenever it looks as if it's going to run dry, and you house will greet you and your guests with a deliciously Christmassy aroma.