What you need:
1/4 cup citric acid*
1/2 cup baking soda
2 to 3 drops of food colouring
12 to 20 drop essential oil
water in a spritz bottle

*available at pharmacies

What to do:

• Mix citric acid and baking soda together in a medium sized bowl.
• Add food colouring  and mix with your hands until well blended.
• Repeat with essential oil.
• Spritz a little bit of water into mixture and mix well.
• Repeat until the mixture resembles damp sand. It should not be very wet.
• Pack the mixture in to a mould.
• Remove from mould and let dry overnight.
• Wrap in cellophane and place in a basket for a nice gift.