as much as I like the droids in Jabba's dungeon I think IG 88 is the most badass. His arsenal alone is unmatched. What is your favorite droid (non R2/3po)... I think the super battle droid is the only one who comes close. Love the wrist blaster.
Speaking of Jabba's dungeon I think a diorama or playset of it would be cool. They could do a cardboard fold out one like they did for Jabba's Palace and the Cantina. Though a full scale playset would be better, they could have the prison cells, the corridor where creatures try to grab C3PO, and the area where EV 9D9 and 8D8 work.