I am going to make a cake similar to this one:
http://cakecentral.com//gallery/1834147 (thanks Karateka for the ideas)
the only issue i do not have a founatin so what can i do in place of a fountain? It's for a Quinceanera.

thank you.

How about another smaller cake with gumpaste or live flowers on top of it?

Floral arrangement or a picture of the young lady 8x12 in a fancy picture frame with flowers around the base of the picture.

A 3 or 4 tier dessert stand with mini cupcakes or cookies or even favor-size bags of candies.

To go with any of the great ideas above...you could also put small, clear lights (like Christmas lights) under the tablecloth, if you are using a white or pastel cloth. A friend of mine did it on her wedding cake table. Very Elegant!