I am doing a transformers cake for my nephews bday and I wanted it to be a 2 tier kind of thing where they are fighting...I am using the mini figurines on the cakes but needed some ideas as to the overall theme or maybe a scene out of the movie..any ideas???

Could you put on it the Autobot and Decepticon symbols?

Autobots:
http://transformers.wikicomplete.info/local--files/g1:autobot/autobot-symbol.jpg

Decepticons:
http://transformers.wikicomplete.info/local--files/g1:decepticon/decepticon-symbol.jpg

Optimus Prime's colors are red and blue. Maybe one blue background with red flames?

One of the big fight scenes takes place on the streets of LA, maybe you could do something with that? Another fight scene was on an interstate.

That's all I got for ya. HTH.

There are some great cakes on CC with buildings/skylines up the tiers. The bottom tier could have buildings all the way around and cars/other things at the bottom. The top tier could be sky with birds and planes. And the transformers can be fighting in different places all around the 'city'?