Put a softgoods cloak on the Mace from the Council Scene...NICE! It's a little snug in the sleeves, but he can sit okay in it.
Also, I bought a slew of Episode I Yoda's when they were on clearance. Mainly for the chairs. I took off Even Piell's outer cloak, and the Yoda chair is perfect for him.
Oppo Rancisis is the toughest to get a cool pose going. His tail isn't quite as flexible as I would've thought. But, if you can pose it properly, it looks best wrapped around the base of the chair. I only wish they'd made his head and torso a little bigger. He seems a little too small there.
Next, the holo-projector in the Jedi Council...you can't tell who it is. It's just a robed figure. In fact, it's almost like a mini-mini version of the holographic Darth Sidious that came with Lott Dod and Count Dooku.