Check out this thread on changing the loader:
Short answer is, not in Flash Catalyst right now.
But you can change it in Flash Builder with a little coding.
Hope this helps,
Thanks for the link. Although, since I'm a designer and not a coder I was hoping for an option within Catalyst. Something similar to the way you set up a scroll bar or something. Oh well, I guess I can live with the black one. I might read through the other discussion tonight though just for kicks. Who knows, maybe I'll give it a shot.