This was my Grandson, Sebby's, sixth birthday cake. I promised him a working volcano. What I did was put a small can I saved from using green chili's into the middle of a cone cake made from rice crispy treats. I used a doll dress cake pan for the mold. To make the volcano "erupt" I pour water over a small piece of dry ice that I dropped in the can. It worked well - smoked all over the cone. Then I put his candles around the top of the crater for him to blow out.
I used four chocolate cake mixes for the base of the cake. I covered it with fondant and used butter cream frosting to decorate all the lava, rocks, and grass. I used gum paste to make the leaves of the palm trees. The trunks are cookie straws. I made a pool of "tar" from melted dark chocolate for the tar pit.
For the plants I molded them from gum paste and veined with a leaf vainer. Then I glued each leaf together with royal icing to make the plants. I used a leaf tip to make the "ivy" growing down the side of the cake and up trees. For the "rocks" I used nut cluster candies.
To make the dirt look sandy I used gold sprinkles on top of brown butter cream frosting. I also used red and white sprinkles along the red lava.
I was going to sculpt the dinosaurs but then found pretty good plastic ones at Walmart for $1 each so I bought enough for each of the kids to take one home as a party favor.
This cake was a huge success with the kids. They really liked the "erupting". I wanted to use sparklers but didn't have any and couldn't find any in the stores at this time of year. Will have to remember to stock up next July.