For my Tk-Apps, I often use package/module names like (if my App is called MyApp):

• MyApp::Widgets: little wrapper around widgets with some defaults (e.g. background, font, ...) to be able to get a flexible layout and shorter widget calls. Some enhanced widgets (e.g. with Tk::Derived) may be specified here as well if the code is short, although then there is more than one package in a module...
• MyApp::Forms: most of the GUI functionality is coded here to separate layout and code as far as possible
• MyApp::Callbacks: callbacks are specified here; if necessary, there even may be more modules grouped by topic)
• MyApp::DB: the interface to Databases, or MyApp::LDAP as interface to Directory Services, ... so I don't need to search through the whole program if the interface changes
• maybe MyApp::Config: this sometimes contains the configuration in global package variables which I treat as readonly, sometimes as configuration objects or an interface to an external configuration
• sometimes MyApp::Global for saving global variables like $Mw, $ToplevelEdit, ...

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