are some other informal expressions involving clouds or sky.
the moon / On cloud nine: if you are over the moon or on cloud
nine, you are both happy and excited.
skies: a very informal and rather unusual way of ending a letter.
It means 'I hope all will go well for you in the future' or 'I hope
the sun will shine for you'.
have one's head in the clouds: to be out of touch with reality;
to be a dreamer or an idealist; to be too concerned with your own
hopes and ideals.
in the sky: something which is promised or planned but is most
unlikely to happen.
cloud on the horizon: some sort of threat or bad thing which
may happen sooner or later.
a cloud: if you are under a cloud, people have a poor or unfavourable
opinion of you.