Help me decide on a henna tattoo?

I'm a young 16 year old girl. I'm getting my henna tattoo this week.. & I just don't know what I should get. I'm thinking about getting a Dreamcatcher on my rib cage but that's just alittle too basic. I want something that says WOW. Any ideas? I would like to put the henna tattoo on my rib cage.. So what do you thinks would look good there?