"Blast from the past" refers to a sudden unexpected appearance of someone or something that is associated with the past. It can also mean a memory, person or event from the past that comes back to mind unexpectedly.

The idiom "pull a rabbit out of the hat" means to perform an unexpected or surprising action, especially one that requires skill or talent. It can also refer to a sudden or unpredictable event or development.

The idiom "in a clover" means to be happy or contented, especially when one is surrounded by good things, such as love, wealth, or health. It's an expression of being in a state of peace and happiness, where everything seems perfect.

The idiom "green around the gills" means to be extremely anxious, nervous, or worried about something. The phrase originally refers to a boat that is rocking violently due to rough seas, which can make its occupants feel ill and anxious.

"Being in love" is an idiom that refers to the state of having strong romantic feelings towards someone. It can also mean being deeply attached or devoted to someone, whether romantically or platonically.