There have been trailer contests on this site before, actually (can't lay my hands on the thread right now). Another one might be fun, if there's enough interest?
I guess the problem with making Star Wars trailers is that we're all so over-familiar with the material, so it's tricky to keep it looking fresh.
JD's RotJ trailer was a very nice example (it's on the Returning to Jedi disc - I think it won the last competition?)