I love Meebo for instant messaging pals on any network, but I don't like their logo or branding... or the chat rooms... I wanted pure chat and nothing more.

The dark and bare theme strips out all buttons, logos, navigation, the meebo blog window and the chat rooms in the footer and leaves with an opaque / faded buddy list and chat windows, and not much else - but that's the idea.
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Select the 'Onyx' theme in the 'preferences' section of Meebo when signed in. That's the theme this works with best.
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The signing in and 'reconnect with meebo' pages are not as affected. The main signing in page will have a dark background and a faded 'Sign On' button - but it still works just fine.