These Democratic Party supporters brought a festive touch to the Colorado convention on the day that delegates were addressed by former First Lady Hillary Clinton.
Hillary Clinton was welcomed to the stage by her daughter Chelsea, who said: "I am proud to introduce my hero, my mother."
The former contender for the Democratic presidential nomination told the convention it was time to unite behind Barack Obama.
"No way, no how, no McCain," Mrs Clinton told delegates, saying they could not afford to allow the Republican Party to win a third term in the White House.
Barack Obama watched her speech from Montana. He will arrive at the convention on Wednesday and address an expected 76,000 supporters at a sports stadium on Thursday.
It remains to be seen whether Mrs Clinton's disappointed supporters will back her former rival.
Mr Obama's choice of running mate, Senator Joseph Biden (pictured here with his wife Jill and Mr Obama's wife Michelle) has angered some Clinton followers.
Mr Obama, who will be the first African-American to be nominated as a US presidential candidate, has 10 weeks to convince voters he is the man for the White House.