Wedding theme color....?

so im having a tropical theme wedding and I want to use the color yellow?... is it a good color for a tropical wedding theme... and my sister already used all shades of green for her wedding and everyone and everysones mama has used the color turquoise, purple reminds me of the dead. ummmm my parents used red for their wedding... ummmm welps.. just what kind of color is there to use for a tropical themed wedding...?