Shape Tween?

Hi I have a logo that when “on mouse over” I want to make it look like it’s inflating. So if you can imagine, the effect being like the logo looking flat and on mouse over it almost bubbles. I have 2 images of both states, the logo being “flat” and the logo being “bubbled” and was wondering if I can make a shape tween to accomplish the effect? I tried that but didn’t work too well… Just wondering if you have any other suggestions?