I'm finding it very hard to visualize (?) what various fragrances are like, let alone what combinations might be. I can visit health food stores and Whole Foods Market and sniff tester samples, but that isn't really accurate on how they will smell in soap, and you can't test combinations at all. Yet it's too expensive to buy EOs at these stores so I have to just take my best shot at mail order.
I think I'll get that eucalyptus and order one or two of your suggestions and try them out.
Thanks Scotsoap, I dragged out my secret weapon (Los Angeles Public Library) and discovered they own several copies. I've just reserved one online and an official agent of my city government will hand me a copy in the next several days!
And I've added eucalyptus-spearmint to my list. I'll use my list next time I order EOs/Fos.