I made this for my 2 little girls 2nd and 4th birthday.  I bought the Tiana barbie doll and baked 5, 4 inch round cakes, froze them (they carve much easier this way), stacked them, gently shoved the doll in the middle and placed the fondant as the dress.  The base is made of round cakes also frozen so I can carve it to look like a lily pad.  The board the cake is on is also covered in blue fondant to look like water.  The characters were store bought toys.