Easy custom for a nice looking obi wan in clone armor:
You need Obi-Wans head, helmet, cape, and weapons from the Sith vs Jedi battle pack, and an AT-TE gunner.
* Take the gunners head and shoulder strap off
* Put Obi-Wans head, and cape on (you can secure the skirt around his waist with one of those clear rubber bands that come with you figures)
That's it. He can really only hold his lance and helmet well, so I would say he's only good for display. You could probably do a much better one with a 41 clone, you would just need to dremmel down the neck-peg to fit Obi's head's smaller hole. I might fire up the old dremmel and try this myself..
Here's a link to a pic of mine:
General Obi-Wan (in clone armor)