This video shows how to model a simple helmet from 2D images with T-Splines. This video is really paced more like a marketing piece than a tutorial, but if you would like to follow along, and the video is moving a bit fast for you, you can read the commands in the command history window in the top of the screen to see what has happened.
Video
Watch video (18 MB) (Right click or option-click the link and choose "Save As..." to download this file.)