I think that it's good for each one of us to write down a quick game design doc, even if our idea won't be the chosen one - this way, the rest of the team can appreciate its potential much better. Ganderoleg has more valid points on this.

I, too, think that the docs should be made public, unless the creator of the doc wants to keep his / her work confidential.

Here's a nice game that combines two genres and might give us some ideas: Tuper Tario Tros