It's a pretty basic cake. This is mainly so she can try it and make sure that I understand what she wants. It's going to be three tiers with a fountain between the bottom and top two tiers. Since her colors are blue and green, we'll alternate ribbons on the tiers.
The bottom tier will be sixteen inches, then there will be the fountain with the clear pillars I found. The top tiers will be twelve inches and eight inches. If you look closely at the background, you can see the fountain in the background.