The green pluses are addons available from the Android Market, for a fee, which let you add more functionality to the grid, there is also an addon for more than 12 spaces, but the free version is fine for most people.
The selling point of SwipePad is that you can access it from anywhere in any app, just by dragging in from the (user defined) edge of the screen towards the center, and the grid appears. Remember this is not a home replacement, just a way to quickly access functions of your phone.
So that’s it. Remember you can do heaps with SwipePad, from simply launching applications to placing calls and sending messages. Enjoy the jump to hyperspace!
Thanks AndroidPhonetips