Disney Dollars maybe? Or maybe a ride photo on Splash Mountain or Tower of Terror or even Rock-N-Rollercoaster...since it comes on paper! Just some "silly" ideas!
My Dh and I got our picture taken by one of those pesky photographers at each park. We have a wall in our living room where we put the picture as a memory from the trip. We actually have a collection of pictures from special vacations/ honeymoon etc. Each Disney trip = another picture
On a more traditional note, I got my Dh a Wedding Anniversary Memory Book for our first anniversary. Each year has a page for a picture and a page to write about anything important that happened in your life that year.