[STiCory]

I have the same issue, and have had it for about a thousand miles, foot off the clutch (engaged) rattle, foot on the clutch (disengaged) no rattle. It's the throw out bearing spinning and it is just worn out, something to eventually be done, but it's not going to stop working for a little while. If you get the chance to do it, I would, but I wouldn't fret over it, unless of course you've been driving on it for 10 thousand miles lol

 

[STiCory]

You have it a little back asswards there, throw-out bearing should only make noise when the clutch is depressed, as that is when the bearing is spinning. Otherwise it is disengaged.

You are correct to a point, the throw out bearing is still spinning regardless of its position. They can make noise either way depending on which portion of the bearing is bad. They can rattle at rest, or they can grind/ whir when the pedal is pushed.