To create my personalized scent, I started with two fresh lemons and then added 2 stalks of rosemary and a teaspoon of vanilla in 2 quarts of water in a pan on the stove. I brought the ingredients to a boil and then turned the heat down to let them simmer.
As the water evaporated, I added more water to keep the fruit and herbs covered at all time.
And as the mixture simmered, the house was full of the smell of spring.
And now...I'm growing my own herbs so I have a built-in supply for a fresh smelling house every day!