My 7 year old is nuts for Super heros especially Hulk.  All of his Birthdays with the exception of his 1st and second Birthday have been superhero themed.  This year it is still a Super Hero but with a twist.  Since David"bruce" Banner is a Sceintist and and also the Hulk my son wants a party in both themed... Gamma rays featured as well.... HELP!!!!! 

I was thinking maybe have first layer with Bruce banner a few sceince themed things at the bottom with Hulk bursting out of the top and a test tub on its side with Gamma running out....  I am not a cake decorator but I have been successfull with having creative cakes every year..  SO now I have set the cake standard!!!!!!!!!!!!!!!!!!!!
 

HELP!!!

Not sure if this helps but i think this would be a good inspiration- maybe having the test tubes pouring down? if you search on pinterest theres so many cakes!

http://pinterest.com/pin/146507794100160237/

Aa for the hulk, maybe you could have him crushing the test tubes or him punching through the cake like this

http://pinterest.com/pin/272045633713752603/

good luck! id love to see the end result

I think maybe we could incorporate the two.  We had all the avengers symbols on the sides last year and the Giant Hulk fist punching the same as this one busting through the center... So maybe we need to change it up.  I am definitely going to post once I figure it out.  ThANKS FOR THE IDEAS