There isn't much you can do to customise worms. Not unless you're the original programmer of course. But you can poduce new levels and new sound effects. I have found only one new level, but a couple of new sample sets. The leel is up for download here, but the sample sets are not. Yet. Basically, it's a picture of the Death Star II, a Star Destroyer and a planet below. There's also a couple of TIEs in shot.It's a scene from near the start of Return of the Jedi. Download it Here.