You mean mock ups?
Why not just stick to default blue-ish/white Facebook theme/UI layout?
I bet someone put quite some effort in designing it, so it can´t be that bad, right ?
Apps on other platforms as well as Kasvopus also follow this design and we see how popular it is by the repeated requests here in this thread..
I think it would be great for Maemo if there where a Facebook App that actually looks like a Facebook App ;-)

Just post if you need help on some specific graphics work and we will see if the community can help making the app look decent and Facebook-like

Or what would you prefer? A completely own design/layout/color scheme?