Clients often want to prototype an idea to see whether it works or not. I don't share client prototypes, I do however share games I developed for various game jams. The jams include the 48 hour Ludum Dare, 1 hour game jam and 0 hour game jam. Each game also has a development timelapse.
At the time of writing, there are 56 public prototypes, available at http://liamlime.com/