The `Hero` singer - who is expecting a boy and a girl with husband Nick Cannon - has created a room with her decorators which celebrates their individuality while also incorporating some of her own taste, and she loves it so much she often goes into it to think about the children`s` future.
She said: "I wanted to create a beautiful, tranquil, cosy environment for the babies. Everything matches, but pieces are individualised to celebrate the twins as separate entities.
"The ceiling has orangey-pink clouds in a blue sky with golden stars twinkling. It`s based on two songs I wrote that are fan favourites, `Underneath the Stars` and `Close My Eyes`.
"Sometimes I just sit in the nursery and stare at the ceiling because I love it so much. To me, it symbolises wanting my children to dream as big as possible and to let their imaginations be unbridled."
Mariah is expecting the twins to arrive within the next few weeks, and hopes she will be able to learn from them as they grow.
She told Life & Style magazine: "Being a mother is probably the hardest job in the world. I feel like, in a lot of ways, children come into the world to teach us.
"It`s going to be a delicate balance between raising them around glitz and glamour and keeping them grounded. One thing I`m sure of is that I`ll be grateful for the twins every day, no matter what."
The 41-year-old singer recently revealed the twins had different personalities, with the boy taking after Nick while the girl was more like Mariah.
She said: "You can tell the personalities a bit. In viewing our ultrasounds, our boy is all ready like Nick, like, `Here I am, take my picture or don`t, and our girl is coyly facing the other way, like, `No pictures,` waiting for a proper debut."