I've never heard of essential oils getting musty, but they do have a limited shelf life and should always be stored in caramel colored glass bottles.
You can make sprays with essential oils - for household cleaning, air freshening and yes perfumey type sprays as well as for wellbeing. You should know that whenever you want to create a recipe with essential oils you only want to make a very small amount that will be used up quickly. Since the oils are very volatile, they will lose their potency and aroma quickly. I have bunches of recipes for essential oils, email me if you'd like me to send them to you - no strings attached.
If you are shopping for essential oils, make sure they are pure - nothing else addes, that they have an expiration date, they are in caramel colored glass, and that they are of the highest grade. Unfortunately there are many discount stores and even dollar stores that sell "essential oils" that really aren't the best. It's important to also know what method was used to extract the essences from the plants. Some companies actually use a chemical extraction method! Quality oils should be either distilled or pressed, depending on the plant they come from.
There are only TWO essential oils that are recommended for neat application to the skin...lavendar and tea tree. All others can cause a skin reaction and should only be used in a bath or with a carrier oil or cream.
Also, every person who uses essential oils should know that there are some that should not be used on small children or when pregnant.
here is a link to a good article on aromatherapy safety:
BellaOnline ALERT: Raw URLs are not allowed in these forums for security reasons. Please use UBB code. If you don't know how to do UBB code just post here for help - we will help out!