Ever wanted to make your thumbnail images look sweet with minimal fuss? Check out Thumbscrew...
To quote:
Thumbscrew allows you to quickly and easily chew through a bunch of images, applying scaling, random rotation, border, and drop shadow to each - even resizing the original, and processing the batch as a whole afterwards.
If you've got a Mac, go download Thumbscrew - it's free! I've been using it to tart up some images for our Theme Builder overview and it's super quick and easy to use.