Yes, being happy is as simple as being grateful. So, let's say alhamdulillah by listing every happiness God give to us, everyday, everytime.
By the way, I was given a mehndi a.k.a henna temporary tattoo by Mrs. Santi just arrived from India. Then I applied it my own way without any technique as I'm not an expert of it :P But It simply makes me happy. Yaaay! I had mehndi on my hand. Aaaaaaand, do you guys want to see the result?