Those are great! We made matching Mickey tie-dyed shirts for our trip in 2004 and they were a huge hit! We had CMs and guests just randomly approach us and tell us how cool they were. And it was really handy to keep track of each other.
I'm currently working on a planning journal-slash-scrapbook for our big vacation this fall. I really need to hurry up and finish it because the trip is fast approaching and most of the plans are already made. A planning journal isn't much use if you get it finished after you get back!
My intent is to have it to record our planning, then have quick pages already made so I can just slap in the photos and embellish appropriately. I expect we'll have a LOT of photos so if I don't prepare now, it'll take me years to finish it.