Much as others might be, I am looking at options for a Clone Wars campaign. As a backdrop, I was looking at a Separatist super weapon. In canon, they start drawing up the plans for the Death Star but they don't really get anywhere with it until the wars are over. I was looking at other options since I don't care for the canon all that much.
I was flipping through my Dark Empire Sourcebook and the World Devastator jumped out at me as something the Seps would have really gotten behind. In effect, it's a giant droid that uses tractor beams to pull matter (from a planet's surface, or chunks off of capital ships) into its molecular furnace maw. Then it uses those materials to feed internal factories that expand itself and produce war material (droid-controlled fighters and other vehicles).
The droid angle obviously fits the Seps, and this weapon looks like something that evolves from a massive mining apparatus, so again a good tie-in to the Seps. The ability to make a flotilla of these things that can destroy targets while replenishing droid forces seems like an even better fit for the aims of the Droid Army than the Death Star.
Anyway, that's just an idea I had for those that don't care about sticking strictly to canon.