I need help with Saber Customization?

Hello, So What I want to do, Is make it so whenever someone goes into my Game they get a Gui that comes up. Asking them to pick the Colors for there Sabers, This is the Saber Model http://www.roblox.com/TJOR-Lightsaber-2-0-item?id=154653335 If you want an Example of What I mean, Go to this place on Roblox http://www.roblox.com/Star-Wars-Force-Wars-over-Coruscant-place?id=127045897