umm.. im not sure if this is a good spot to post this but... i had this idea which id like to see other ppls take on cuz its so AWESOME!.. lol anyways here it is
some form of whale type HUGE thing that Eats planets atmospheres ... but has been taken over by Aliens and they have built a city on IT and control him and also they drag there old remains of there planet around in a giant bubble on a rope from behind the thing...and they have many ships flying around this whale/city.. military/other..
mix it up any way u want..
anyways think of this like a DSG! now off to your pensils and returned with your sketch's/paintings
PS.. u can see my HORRIBLe quality version of this idea in my sketchbook .. BUT DONT LOOK until ur done. i dun want u getting any outside ideas