There were multiple Android prototypes as the OS was designed to run on different form factors from touch-less candy bars to devices like the HTC Dream that had a full touch screen.
The fact that the myth of Android being a Blackberry clone until the iPhone came out is a text book example of something being repeated so many times that people just think it's true. Of course there was a prototype that looked like the Blackberry but it was just one prototype. There were obviously others.
Here's another prototype: http://www.osnews.com/img/25264/android-phone-touchscreen.jp... http://www.osnews.com/img/25264/android-phone-history.jpg showing the latter configuration.
The fact that the myth of Android being a Blackberry clone until the iPhone came out is a text book example of something being repeated so many times that people just think it's true. Of course there was a prototype that looked like the Blackberry but it was just one prototype. There were obviously others.