See: from the sublime to the ridiculous

• pearly gates
• pecking order
• pedal to the metal
• peel off
• peeping Tom
• pell-mell
• penchant for
• penchant for something
• pencil in
• pencil someone in
• pencil something in
• pen is mightier than the sword.
• penny ante
• penny drops
• penny for your thoughts.
• penny for your thoughts
• penny saved is a penny earned.
• penny wise and pound foolish
• pen pusher
• pen pushing
• People who live in glass houses .
• People who live in glass houses shouldn't throw stones.
• pep someone up
• pep something up
• pep talk