pretty penny

a pound to a penny

Very likely; almost certainly.

bad penny

A person or thing which is unpleasant, disreputable, or otherwise unwanted, especially one which repeatedly appears at inopportune times.

just another pretty face

Someone who is attractive, but not too distinguished in other areas.

not a pretty sight

Something disappointing, disquieting, disreputable, or otherwise unworthy of admiration.

not just a pretty face

Something that is more useful, versatile, or intrinsically valuable than might be assumed.

penny for your thoughts

Used to inquire into the thoughts and feelings of another, especially when the person appears pensive or conflicted.

penny in the fusebox

An improvised repair made with no regard for safety.

penny pincher

One who spends little money; one who is very frugal or cautious with money.