Place a block of foam into the container. Cover the base with your moss. Alternatively you could use foliage to cover your mechanics. Start with bird of paradise. Place as shown in the photograph.
Next lets add some carnations.
Carnations are a very good keeping flower. They are easy to work with and are available in a wide range of colors. They fill space well and are easy on your budget. Place as shown in the photograph. When you finish with your carnations, take your poms and start to distribute them throughout the design.