Mound Flower Arrangement
I'm sure you are familiar with this style. Viewable from all sides, the floral elements combine to form a half-ball shape.
This round flower arrangement style adds a pleasing accent to any setting.
Triangular Flower Arrangement
The triangle shaped flower arrangement can be created to be viewed from all sides, or it can be made one-sided if it is to be placed against a wall. It can be an 'A' shaped design in a tall container, which is very nice as an altar flower arrangement for a church or wedding ceremony. A large bow can add flair.
Or it can be a low, flattened pyramid shape in a low container, which creates a horizontal flower arrangement suitable for table decor at any celebration. A candle placed at the center adds a romantic touch.
Asymmetrical Flower Arrangement
This elegant style, known as the Asymmetrical L, is created as a one-sided floral arrangement, and looks best in a low container.
It doesn't require too many flowers (depending on size) and makes a nice display for an entrance hall, corner location, mantel, bookcase, or the ends of a buffet table.
Crescent Flower Arrangement
The one-sided crescent flower arrangement is similar to the Asymmetrical L style. The design forms a smooth, low half-moon shape rather than straight angles. A low oval or oblong container is recommended, but not required.
This floral arrangement makes a graceful accent to an entrance hall, corner location, mantel, bookcase, or the ends of a buffet table.
Hogarth Curve Flower Arrangement
This one-sided style, also called the Hogarth S, extends the idea of the half-moon shape in the crescent style. Floral elements curve in from the top and sweep down to suggest a smooth, flowing 'S' shape.
This simple and graceful flower arrangement captures attention when displayed in a tall vase, or as a door or wall piece.
The Hogarth Curve can also be incorporated into a wreath design.
credit : http://www.silk-flower-smart.com/flower-arrangement-styles.html