To demonstrate using skins, here is a small program named "Personal Knowledge Base." It collects files, stored compressed in the database.
Articles Written by Thomas Aust
Compare and verify the results of changes in a database structure. You can define a set of queries that can dump their results to a file. These files then can be easily compared.
Very cool (you need to see this!) add-in for adding Message Box code to your application. Doesn't sound like much, but give it a try. Extremely useful!