Kim,
Hi I'm new to DIS so I can't post photos, so I'll just tell you what my son had on and what he did the 2 times he was chosen for Jedi training. The 1st time was 12/07- he wore red track pants, white Power Ranger top and we had heard you need to jump up and down so he did. He got picked on our 2nd try that day. The next time we sat a waited at least 20 minutes until the show he made sure he was up front on that line. He had on a red Phillies hat, navy Jedi training shirt and gray shorts(10/08). He's had red on each time, I did read you should have your kids wear yellow(I'm going to put him in his yellow Star Wars shirt this Oct. and see), and I do know they tend to pick the kids up front who are very animated, jumping up and down and reaching high with their arms in hopes to be chosen.. Hope that helps.
I love your scrapbook pages, I don't do anything digital, all by hand. Hopefully when I can post photos I can add some of the pages I've done from my trips.