While focusing on the therapeutic properties of essential oils is good practice when making a blend, one should still take aesthetics into consideration.
I was putting together a blend of oils for a "medicine" bath and I did not take into account how all the ingredients would smell when put together. I found yet another recipe for the scent of bug spray. Yes, this has happened before, and I have the awful habit of not writing down the combinations I make for myself at home. The blends I make for sore muscles are usually the dangerous ones for not smelling pretty.
Luckily, my skin only smelled faintly of bug spray for an hour or so afterward.