What about a game intro? On my computer loading is really fast (the loading with icons, less than a second) but for others people?
This loading is not very annoying but we can use this little time to show good messages like:
- "This game is open source"
- "Assets and code are under CC and GPL"
I think it's important because it's parts of the game and when some people look at it, they can think to contribute to the game. So what about a game intro like this?
http://vimeo.com/18851362
Or something else but you have the idea.

Studios have game intro why not for open source games.