Are you staying onsite? Resort specific items are much more sparse than they used to be, but you could get a resort specific pin, some resorts have mugs and the like. I love those to remember where I've stayed.
A few years back my friend bought small glass slipper figurines and had her little sisters' names engraved on them. There were options other than the slippers as well, small figurines, castles, etc. I believe that was the Crystal Arts shop on Main Street in MK. They were absolutely beautiful and I plan to go back and do something similar.
You can always get silhouettes drawn in MK, and I believe at the Haunted Mansion gift shop they now have some kind of Ghostly Portrait you can get done.
I'm a fan of porcelain figurines, I saw beautiful ones at the World of
Disney store in DTD/DS (it was smack dab in the middle of the renovation so I don't know what it was called at that point). I know they definitely still have great locations at DS to get original figurines, my friend bought me a beautiful Mickey and Minnie figurine with Walt Disney World engraved on the base. Unfortunately I have not been back since the completion of DS so any specific advice I give you would probably be outdated.
Have a great trip!