Plain bath salts (like Epsom salts)
Essential oil of your choice
Powder or paste food colouring (not liquid)
Put some of the plain bath salts into an old bowl. Put in a tiny amount of essential oil (about 2 drops for every cup of salts) and a tiny amount of food colouring. Stir well with an old wooden spoon until all of the salts absorb the colour. Repeat with as many different colours as you like.
Carefully pour the salts into a clean jar (we layered different colours).
Cut a square of fabric to fit over the lid of the jar, tie in place with some pretty ribbon.