I don't know how it is with all of the apps but some its not a matter of needing bling with gradient backgrounds and non-stock icons everywhere but a polished look.

Does the plain look make Dialcentral / ejpi / Gonvert / quicknote ugly?

witter I can understand. A good mix of stock and non-stock icons plus something like chat buubles for each tweet (with possibly distinguishing colored backgrounds like some of those mac chat apps) would help in conveying information.

EDIT: Fixing my show of ignorance of twitter