Alternate aspect ratio of thumbnails?

I am a verry happy user of the Hungred Post Thumbnail plugin. It is a great, elegant, well-working plugin – thumbs up for that!

I have a question though. The plugin now generates a thumbnail based on the aspect-ratio settings in the admin area where you can set the width and height of the thumbnail. I wonder if it is possible to alternate aspect-ratio’s of thumbnails.
So if it is possible to alternate between horizontally, vertically or square standing thumbnails.

I know this might require a lot of recoding, but I think it might be a very useful feature. And up until now I have never encountered a plugin that can do that.
Any ideas on how to do that?