notmyname's mention of their process does reinforce one of the difficulties you'll have to address if you want to make a Bootstrap-like template - almost every company has a slightly different process.

OpenStack doesn't use GitHub for issues or pull requests, while MongoDB doesn't use their issues but does use pull requests. Some projects require you to sign a contributor agreement, some don't. Different languages (coding standards), different platforms (testing), etc. So you'll probably want to bake the customization aspect (a la http://twitter.github.com/bootstrap/customize.html) into the very core of your idea.

As for examples: - the guidelines for the MongoDB project (not bad, I think) are here: https://github.com/mongodb/mongo/blob/master/CONTRIBUTING.rs... - and the Contributor Guidelines for Chef are quite good too: http://wiki.opscode.com/display/chef/How+to+Contribute