How do I get him to be more creative?

Go to a book store with him, while there giggle about the adult sex books, and then look at them with him and maybe even buy one - that should spark the "creativity" as you call it.

And yeah, you should always fake it "a little bit" - but make sure to really get into it when its good - you can also guide by the sounds of your moans - guys respond to that well for the most part.

Honestly I hate it when I woman tries to lead my hand or body during it - much prefer to hear her moan or feel her tremble when what I am doing is working.

You should be creative first- act out your fantasies! Let him take a break and show him what you want by doing it to him - but make sure it's pleasurable or else I don't think he'll ever try it.
I'd try tying him up.

Perhaps try talking dirty to him. It might turn him on or try other positions that maybe will be more comfortable and sexier for the both of you