Rolla, that's a very nice idea, I appreciate it.
Here's the differences (or at least my take) of a Group Project and a Customizing Challenge -
Group Project - Everyone tries to make the exact same character, shows some in-progress shots. Usually an established character that hasn't seen plastic yet.
Customizing Challenge - A "type" of character is made; everyone makes their own intrepetation of a fan-fic character. Make your own Smuggler, Star Wars Hottie, etc.
So, for a Customizing Challenge, maybe a fan-fic Badoo Corba Terrorist? Here's what a couple of them already look like -
Trigg Fuuda - Leader of the Badoo Corba:

Badoo Corba Mandalorian Assassins:

Troffar the Terrible:
