Try EOU (Essential Oil University) -- www.essentialoils.org -- They have a great range of EOs and the prices are reasonable. There's a wealth of information out there about the therapeutic value of EOs and the safety of some of them. There are varying opinions about how much of much lasts through the heat of saponification, etc. You can finds threads with much more specific info when you search for 'EO' on this forum. As far as scents, you can blend almost anything together. Especially citrus (lemon, lime, orange), lavender, mint (usually peppermint--spearmint tends to me think of chewing gum), anything herbal... --you can't really go wrong. For example if you have orange EO, you could blend it with other citrus, you could blend it with clove or anise or cinnamon, or you could blend it with vanilla or mint...so many possibilities. You could blend mint with lavender, citrus, patchouli, ginger... www.aromaweb.com is a great resource for general learning and blending.