→REAL BLUE BLOOD=high or noble birth.SENTENCE:Rajamatha Gayathri devi was a real blue blood.
→RED HANDED =catch someone while doing. SENTENCE:The thief was caught red handed.
→BLUE MOON=Very rarely. SENTENCE:We go out for family picnics once in a blue moon.
→GREEN THUMB =flair for gardening. SENTENCE:My garden is beautiful.I have a green thumb.
→SILVER LINING=Something good in a situation. SENTENCE:Mary's meagre income was a cloud in the silver lining.
→PINK OF HEALTH=Very good health. SENTENCE:My great grand father at 105 , is in the pink of health.
→BLOT FROM THE BLUE=Sudden or unexpected.SENTENCE:Death of A.P.J.Abdul kalam sir hit the nation like a bolt from the blue.
→GREEN WITH ENVY=Feel jealous. SENTENCE:When Catherine saw my necklace, she was green with envy.
→PINK SLIPS=Lose one's job. SENTENCE:Lot of people got pink slips while recession.
→RED LETTER=Very important. SENTENCE: January 29th is a red letter day in Indian history.
Hope this helps you