Where can I find an alternate report format for Sales Quote, Sales Order, Invoice, Quote Request, Purchase Order, and the like? Someone may have already re-formatted those reports (column widths, field locations, etc...) in a way that would match my needs. If they are only available through installing modules then how can I filter the module list to find them?

A module that only changes these report formats might be called a "skin" or "theme" in other applications.