On top of the world
People were on top of the world when the national football team won.
Face like a wet weekend
'Are you alright? You have a face like a wet weekend.'
On cloud nine
Jack was on cloud nine when his girlfriend said ‘yes’ to his proposal.
Not the end of the world
Don’t worry about the debt. It’s not the end of the world.
Make one’s day
This birthday surprise really made my day.
Let one’s hair down
'Tomorrow is your birthday. Go home early tonight and let your hair down.'
In seventh heaven
She was in seventh heaven when she won the lottery.
Feel blue/have the blues
He’s been feeling blue since the day she left.
Over the moon
I am over the moon about my trip to Korea in June.
Get a (real) kick out of something
They get a kick out of traveling.
Have a whale of a time
We had a whale of a time at the party last night.