Exactly what kind of slideshow are you wanting to do? If you want something that is dynamically changeable, then you are going to have to have some code.
I'd like something that is only pictures - no weird descriptions or borders or anything around it and I just want it to cycle through 3-5 pictures, fading in and out continuously. I don't know if I understand what you mean by 'changeable' since if I needed to change it, I could just make a new one, right?
Not sure if you solved it, I would just create a swf in Flash, then place it into Catalyst.