Slideshow of images in Featured Image

Hello everyone!

I'm new to WPMU, but I'd really like to take my minimal knowledge of WP to the next level and use it to develop a new, shiny, easily-updatable portfolio. Here's the thing: I'm a writer and a beginner web/graphic designer, so I opted for the Business Portfolio theme, since it didn't seem overly image-centric.

However, I do have a few site designs I'd like to show off, and I thought the Featured Image section would be a great place to do that. Is there any way to configure the Featured Image so that it can display multiple images, not just one? If possible, I'd like the captions to display below the image, so people know what they're looking at.