I'd imagine that there are as many different types of escape pods as there are classes of ship. Some more similar than others (i.e. those from a Constitution and Miranda more similar than those from a Galaxy and Nebula) but that there'd be variations with every class.
My only request is to try to give the escape pods something new and interesting rather than trying to make them smaller versions of shuttles. I loved the E-C's vertical impulse engine, the Romulan drydock, and the captain's yacht's launchbay. Seeing creative new stuff like that (stuff you don't often find on trek-art sites overflowing with derivative ships and uniforms) I feel like the show's still on and I'm a kid again looking at the future just a TV or computer screen away.