Sweet Idioms

a piece of cake- very easy. It's a piece of cake. 
as easy as pie- very easy. It was as easy as pie. 
like giving candy to a baby- very easy, especially when you do something wrong. It was like giving candy to a baby. (Of course the baby will accept it.) 
a fruitcake- really strange crazy, a kind of serious word. She's a fruitcake. 
going bananas- becoming crazy, especially with too much to do. I'm going bananas. 
nut/ nutty- funny kind of crazy, usually makes you laugh. He's a nut. or He's nutty. 
a tough cookie- a tough or strong person, or doesn't show his emotions easily. That man is a tough cookie. 
sugar and spice- very sweet, nice, or kind, feminine, (used for girls.) Her daughter is sugar and spice.