This is somewhat related to what I mention in my "Team" Accounts/Managing Multiple Accounts post, but more about one person who does a lot of cool stuff (which is only a little different than my concerns over multiple identities). :P
I've made a few weird games that are more for friends/don't fit our aesthetic and some tutorial sort of things that I just hide away on my personal account page, but something closer to what you've described would be much more appealing.