Second Life is an online game that in most respects is COMPLETELY customizable! I joined up after the Mandalorian Mercs started up an official SL group.
Simply sign up at
www.secondlife.com and get an account. Then download the "Second Life Viewer 2" for your system. After you log in, send a message to me. My name in-game is "NicoFett" and i'll send you some free basic Mandalorian armor as well as a stand that will alow you to customize its colors (if you ask real nicely ill throw in some guns)
Some screenshots i've taken:
Mercs gathering:
Nico with his floaty orby droidy thing:
Working on my new helmet:
CC-7219:
Riding TRON cycles through Mercs CIty: