(I've seen this done with real rocks and of course you would only then use the essential oils. The rocks absorb the oils and release the aroma, sort of like a clay object would do.)
Mix 1/2 cup of flour (wholemeal flour gives great texture.)
1/2 cup of salt
1/4 teaspoon of essential oil (your favorite scent)
2/3 cup of boiling water
And food coloring if wanted
Mix all the dry ingredients together then add the oil and lastly the hot
water. Add the color drop by drop.
Once cool enough to handle roll into small balls around 2-3 inch in size or
be creative and make assorted shapes.
This mixture dries hard after several days in a warm but dry area