I had a cold at the time and couldn't smell anything properly. They have charts that tell you scents that mix well together and their uses. For example, are you looking for calming or energizing? They come in small vials in a variety of price points from around $5 to around $15.
You will want to mix these in a glass bowl with a metal spoon as you don't want any scent remaining in tools or bowls you use for food.