Doing EO blends are always a good idea and selling point. Maybe get an aromatherapy book if you don't already have one and see what all the different EO's are good for and you can come up with some blends. If you stick to the basics you can make some nice blends. To get some good quality EO's can get pricey, ie Rose or neroli, but the basics can be reasonable in price. Good luck. Learning about EO's is quite interesting. Enjoy.