.You can make India in your poster ,the map of India and draw different cultures in that if you want.
.You can write a slogan ''Hindu Muslim Sikh Isaiah Apas me sab BHAI BHAI. And can draw a picture based on this.
.You can show that ''A person can't do a thing alone ,but a group can''
.You can add this line-''On Earth or India (your choice) ,we all people are like flowers and Our country or Earth is like a bouquet in which we all live with happiness and we all look beautiful....