Yin zhi hua pai is usually a heart-shaped or star-shaped bouquet with money notes attached. The notes are usually of denominations 50, 100 or 1000 dollars.
Last week I saw some stagehands putting up these bouquets at the street opera show at Chinatown.
I talked to a woman who came almost everyday. She said Long Koon Tin (the lead sheng in the shows) received 13 'pai' during the period of his performances. For example, in this picture he got 3 'pai' which could be given by 1 or more persons.
The other 2 'pai' are for the first dan and the second dan. You can see them in the video in the post below this.
and one for the second sheng.