I generally use 12" - 14" ostrich feathers*. They are easier to find in many different colors and cost less than the larger ones. But if you want to create really luxurious ostrich feather centerpieces, you might want to go for [wgLongWhiteFeathersLink]20" - 24" ostrich feathers[/wgLongWhiteFeathersLink]. You can see the difference in the way they look in the picture above.  The vase is the same size in both cases.