Yes, the Disney Days of Christmas store in Downtown Disney is the shop that you want to go to for personalization. I originally bought mine during my honeymoon in 1999, but didn't realize that personalization was possible until I saw a pair as an example in 2002 (Very neat I may add!) You have a choice of how you want decorated (i.e., colors, how personalized and can have a choice of Pixie Dust, Hearts, Flowers, etc...)
I ended taking mine down in 2003 and dropped off 1st or 2nd day. If I remember, they needed at least 3-5 days to get done. It was $5.00 per hat and then I paid $8.95 to have them ship home. Well worth the cost because if they get damage, they will replace!!!!! So, my total was $20.19 inc. tax.
Hope this helps and definately well worth the price. I plan on making a plexi glass box to put them into and put other wedding mementos as well as a special keepsake.