We've only decorated doors during the holidays and yes, one time it was at AKL. The doors were wooden, I remember because we had to use double-sided tape. Just make sure it's the soft kind that won't do any damage.
We even left a "Happy Holidays message center" on the door & let me tell you this is one of the BEST Disney memories EVER! We got messages from people from ALL over the world wishing us 'happy holidays' in different languages, messages saying they loved our decorations, even notes from CMs saying they loved walking past our door, etc. It was SOOOO much fun. One family from Chicago even left us two little Mickey pins in our message center as a holiday gift.
I think I am going to decorate the door again when we go for Daniel's B-Day in December.
PS: I still have the messages & LOVE going back to read them