Take gram flour and turmeric powder and mix it thoroughly. Rub it between your palms and pass it through a sieve three to four times for a smooth texture. 

Mix henna powder with refined flour or rice flour for a natural green colour. Remember that henna when mixed with water can stain the skin. 

Dry red hibiscus flowers and grind them into a fine powder, then add flour according to your preference to make the colour dark or light. 

You can make purple by grinding black carrots and mixing them with corn flour. Leave the mixture to dry.