At this point, every group has created a user interface and handed it in, so there's no point in secrecy any longer.
In Architecture, they do something called a "pin-up" where students post their work (literally on a wall with pins), then others (peers, other teachers, visitors) can wander by and comment on the pin-ups.
Shall we do a pin-up? This is totally voluntary, but might be fun, and I for one would like to see what everyone came up with.
Here's the idea:
Take a snapshot of your screen. If you choose "Do" from the World menu, you'll find that there's an option like "Utilities grabScreenAndSaveToDisk." Do that, and your cursor will let you choose a rectangle of the screen. That section will get saved to disk as a GIF.
Create a page for your group below.
Upload your picture as an attachment, then put the picture on your group's page.
Invite others to comment, and let's see what happens!