Give your webcam a different point of view!
I've been having some fun with a piece of software called iGlasses and a piece of hardware called a Huckleberry. Here is an example of a response in a video conversation using seesmic. If you watch Freida's post, (embedded below mine so you can see the post to which I was replying) she demonstrates many of the settings available in iGlasses for use with your webcam. (Alternatively, you can click on the arrow icon inside the video or view the other videos in the conversation underneath the video to see more of the dialog we had in seesmic.)
(Sorry if my audio is a little blown out in some spots. Adjusting your volume before playback might be a good idea.)