To make bath salts, soak Epsom salts or Dead Sea salts in a jar with drops of your favourite essential oil. Layer in a container with dried flower petals.
Decorate the lid by cutting a piece of lace to make a cover and glue to the lid, leaving a decorative edge. Finish the edge with a coordinating colour of ribbon.
If you make a large batch of salts, try fastening a little wooden scoop to the ribbon, and hang it down the outside of the jar.
You can use any combination of flowers and oils, but I would suggest that you experiment in small batches for yourself first, as some fragrances change over time. Place a drop of each of the oils on a piece of kitchen paper and leave in a jar. If you still like the combinations a week later, go ahead.