I made this cake for my littlest boys fifth birthday. The base is a 9x12 cake, with an 8" cake cut into a ring. For the 8' cake I used a German chocolate round that I had in the freezer. I should have made it pound cake too. It was way too soft. The planet is two cakes baked in the Wilton soccer ball and a 9" cake between them. I used my favourite sour cream pound cake recipe and added some cake sprinkles to give it that funfetti look. The frosting is sour cream and the fondant is homemade marshmallow fondant. It tastes so much better than the cardboard stuff that Wilton sells. And it is fairly easy to make. I used it to make the lustre dust stars on the base too.
The sugar ring was fun, I broke it taking it off the mold but it still looked pretty impressive and it was great fun to crack before cutting the cake. My dh and older boy made the astronaut using fondant and a glow in the dark Frankenstein figure.
There are more photos and party details on my blog. http://carmen-whome.blogspot.com/2009/09/5-trips-around-sun.html
I loved making this, it was definitely the most challenging cake to date! Only my second time with fondant. Nest time I will make sure that the frosting underneath is the same colour as the fondant. The tears would have been much less noticeable. But the birthday boy liked it, so I am happy with it too.